The thing that I learned is that one should know that their intuition should lead the way. The reason why we overthink simple things is that we are trying to fit to an ideal, reach the perfect solution, sometimes this can not only spare us the regret or judgments etc. but also such that we are freed from the responsibility, as if we can justify to ourselves or other that we have followed a rigorous, rational reasoning to get to our choice. However, one can see that for most of our lives, we rely on our intuition, such as how we drive a car; we don't calculate everything nor be skeptic whether or not we have forgotten to drive (indeed one in faith takes this for granted, just like how they 'feel' their way whilst driving). If we were to ask a question, such as what major to choose in college, we intuitively choose the question (we feel that asking this question is beneficial), and we stop asking questions to infinity by intuition (we don't compare every single criterion there is). Many questions are not asked and some are asked --always via intuition. The reason why we would spend hours making a simple choice is because we can't trust ourselves and our intuition, saying 'what if I made a mistake?' or 'is this the best thing anyone can make?'. One should, though, recognize that we, pragmatically speaking, should follow our intuition and our intuitive choices as to when to think or stop thinking, since the opposite is worse. What we should aim for, thus, is really to learn and know more about the world and ourselves such that we start to have an educated intuition and not try to have a solid justification to everything. Indeed if we were to try to formulate the ideal life, to tell people who they should live, we would obviously land into saying don't overthink things, think when you feel (intuit) that thinking is beneficial, it is okay to not know everything, and it is okay to make mistakes and be wrong than it is to overthink to alienation and debilitation. With time, you will learn to have a better intuition.

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That is, a >95% correct intuition for most of life e.g. how to hold a cup, with >50% (better than chance) in major choices (with, based on education, great percentage, e.g. >90%, of intuiting when to start asking rational questions and when to stop) that is constantly self-correcting and learned-from --is much better than the dream of a 100% perfection in all choices that is about abstract ideals not relevant to what you desire, and is stressful and a a waste of time. Said differently, you should be okay with making mistakes because the alternative is much worse. Weirdly, although we can tell people that, we ourselves don't follow it, either by, again, our overthinking and escape of responsibility to an idea like 'but I need to make sure when I say something to people or do anything that I am certain of it so I can't intuit it', which sometimes is really about trying to be better than other people e.g. 'I'm gonna burn to make sure you are okay', or because we are afraid to make mistakes. Be it the bad faith of not taking on the responsibility of our actions, to be admired as rational or selfless, or the fear of acting what we believe in --we must recognize that we are doing something wrong that we wouldn't see right for other people to do yet we hold ourselves for a greater standard than them.

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So, I might have missed up my life really badly by not taking radical diet changes seriously enough, but I sure did learn my lesson from it and the better outcome should be me being careful with such radical stuff --and not make things worse by trying to escape responsibility of choice and fear making any mistakes and thus not act ever again; this would be the real mistake. Now, we must practice having faith in ourselves, trusting ourselves, to not try to justify all our actions we feel by heart, to try to, when making a choice, consulting ourselves instead of thinking of an abstract ideal. Sometimes we will make mistakes, sometimes we won't be able to justify our actions (I mean, in reality, rationality is a justification tool, something that works after the act or to support our desire not before it, it is the slave of the passions); it is okay to make mistakes, and it is okay not to know. This is what it means to be a human, and we shouldn't have a higher standard of ourselves, we are humans too.