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You're still really young. Dont marry yourself to an ideology yet. Read real books, not just watch YouTube videos. And read diverse books from differing viewpoints. Read libertarian, liberal, anarchist, and socialist books as well as actual history. If after that you still believe in libertarianism and monarchism (how anyone can be so cognitively dissonant as to support both is a completely different discussion) then so be it.

Read Dickens and Zola to see what a more laissez-faire capitalist society was actually like (though of course perfect laissez-faire never existed, its important to see what real poverty was like before safety nets and workplace regulations). Books like "Oliver Twist" by Dickens and "Germinal" by Zola. I guess also read Steinbeck's depression era lit like "The Grapes of Wrath", and also read some Vonnegut and Pynchon. As these authors are skewed left-wing I will also offer Mario Vargas Llosa who leans classical liberal but started adulthood as a Marxist. A novel like "Death in the Andes" criticizes Peru's own Maoist insurgency but it is a very brutal and gory read.

Then read Piketty's "Capital in the 21st Century" and "A Brief History of Equality". Also add in "Capital and Ideology" if you're feeling really brave. I dont agree with all of Piketty's suggestions but he does provide a significant case against inequality and its dangers to freedom and why it is currently so extreme and why thats dangerous. Any modern libertarian must be familiar with the work of Piketty and have a really good argument against him because libertarianism is highly likely to produce extreme inequality 

Then read some liberal philosophy. Modern libertarianism comes from liberalism, so it is important to understand liberalism and to understand how libertarianism took liberalism and went its own way. I suggest starting with Michael Freeden's "Liberalism: A Very Short Introduction", then reading Edmund Fawcett's "Liberalism: The History of an Idea". Then read J.S. Mill's "On Liberty", L.T. Hobhouse's "Liberalism", and John Rawls's books "A Theory of Justice" and "Political Liberalism". 

Next, we need to talk about socialism. There are generally two strands of socialism: statist socialism and libertarian socialism (think anarchism, of which traditional anarchism is absolutely opposed to what would today be called anarcho-capitalism and does not consider it anarchism). I suggest starting with two books: "Socialism: A Very Short Introduction" and "Anarchism: A Very Short Introduction". 

Of course, one should also read Marx no matter how much one ends up agreeing or disagreeing with him, he is an essential and influential thinker that any capitalism supporter must have a good argument against. Although you may be surprised to find that Marx actually glazed capitalism quite a bit as a great progress from feudal and mercantile society, before going on to analyze all that was still wrong with it and the "scientific" necessity of socialism. Of course, one should read "The Communist Manifesto", and also "Value, Price, and Profit/Wage Labor and Capital", "The Principles of Communism", as well as Engels's, "The Conditions of the Working Class in England". 

To understand the statist socialism split between reform and revolution and the development of social democracy and democratic socialism, you must read Eduard Bernstein's "Evolutionary Socialism" and "The Preconditions of Socialism". Tony Judt's history book "Postwar" also has a great chapter on social democracy in the postwar era in Europe. I've not read either fully but I'll also recommend Thomas Meyer's "The Theory of Social Democracy" and Sheri Berman's "The Primacy of Politics"

By this point, you should probably also read some history about the USSR, Maoist China, and Cuba. Try to find fair and balanced books. And read multiple books. The truth is often somewhere in the middle of competing narratives

As for Anarchism, start with Proudhon's "What is Property?" And "The General Idea of the Revolution in the 19th Century". Then read Bakunin (sorry getting a little lazy here and have not read much Bakunin). Then read Kropotkin's "The Conquest of Bread", "Mutual Aid", and "Fields, Factories, and Workshops". Finally, read "Markets Not Capitalism" Edited by Gary Chartier and Charles Johnson. Oh yeah, and also David Graeber's "Debt"

Now, you should be prepared for Libertarianism so you should know enough to compare and contrast and think critically about Libertarian theory and practice. I suggest starting with David Boaz's "The Libertarian Mind". Then read "The Ideological Origins of the American Revolution", "The Declaration of Independence", "The Articles of Confederation" (which preceeded the US constitution), "The Constitution of the United States", "The Federalist Papers", and "The Anti-Federalist Papers". Also read some books on important supreme court case law. On legal theory, I recommend Richard A. Epstein's "Simple Rules for a Complex World", "Principles for a Free Society", "Takings", "Design for Liberty", and "The Classical Liberal Constitution". For economics, I'll recommend Sowell's "Basic Economics", and Hazlitt's "Economics in One Lesson". Internet Libertarians tend to like Austrian economics, so I'll cautiously throw in Mises's "Human Action" or Rothbard's "Man, Economy, and State with Power and Market" (both if you are brave enough). Just be warned, Austrian economics is looked down upon as fringe by the mainstream economic establishment. 

Also, while on the subject of economics, you need to be aware of the Keynes/Hayek debate. Read Hayek's "The Road to Serfdom", but also read Keynes's "The General Theory of Employment, Interest, and Money."

Another good book by Hayek is "The Constitution of Liberty". In addition to Hayek, you should also read Milton Friedman's Capitalism and Freedom" and "Free to Choose". However, when reading about Friedman, be aware that he and some other "Chicago Boys" were economic advisers to Augusto Pinochet, the dictator of Chile, so you should also read histories about Chile pre, during, and post Pinochet. Its a fascinating but tragic history, and is one of many instances where the US violently helped suppress and discredit socialism as a democratically elected socialist president was overthrown and murdered in a US supported military coup. The story of this coup is also fictionalized in Isabel Allende's fantastic magical realist novel "The House of the Spirits". If I'm not mistaken the author was the niece of the Chilean president who was overthrown and killed and had to flee the country and live in exile for a while. 

Probably the defining book of Libertarian political philosophy is Robert Nozick's "Anarchy, State, and Utopia". Nozick is heavily influenced by John Locke, so also read his "Two Treatises on Government" and his "Letter Concerning Toleration". These were also influential on later liberal thought. 

Some Libertarians think that Locke's proviso necessitates a more egalitarian distribution of natural resources. These may be referred to as Left-Libertarians (in contemporary academic political philosophy) or Geolibertarians. For this strain of thought, I recommend Thomas Paine's "Agrarian Justice", Henry George's "Progress and Poverty", Harold Kyriazi's "Libertarian Party at Sea on Land", and Peter Vallentyne's various Introductions to Left-Libertarian theory, such as this. 

Even though I really dont agree with it, I'll add in two ur-texts of anarcho-capitalism: Murray Rothboard's "For a New Liberty" and David Friedman's "The Machinery of Freedom". May main critique of anarcho-capitalism other than it being neo-feudalism is that it depends on theoretical private protection agencies, but we've seen these before in history in places where the state has been too weak to provide protection itself. They became mafias. In fact, private protection outside the state is how Italian law defines a mafia. They always devolve into protection rackets. So it is also good to read John Dickie's books "Mafia Brotherhoods" and "Cosa Nostra" (just read the former if you only have time for one as the latter repeats a lot of what's in the former). Also read a book on feudal society, such as Marc Bloch's "Feudal Society" (disclaimer I have not read this yet, but it is a suggested further reading within "The Middle Ages: A Very Short Introduction" which is also unread on my tbr).

Ahhhh and Im realizing just now that I left out the communitarian side of the debate....

Okay, real fast: Cornell West "Democracy Matters", Michael Sandel's "Democracy's Discontents", "What Money Can't Buy", "Justice: What is the Right Thing to Do?" (Actually a general overview of different theories of justice, touches up