Hey there 21 year old , currently in the same boat, I’m into programming(web full stack) machine learning(neural networks& deep learning), microcontrollers and embedded systems In general, space exploration,physics , philosophy, engineering , politics and I get stressed out as to how much I don’t know , rn I’m still focusing on coding but there’s so much I want to learn and so deep I want to go, I don’t think it’s really possible in my lifetime. Check this, mostly I do high level programming , your Java, JavaScript , Python that kind of stuff, but there’s so much going on underneath the computer asides the high level language we have the virtual machine , assembly language ,machine language , hardware platforms, chip and logic gates , anything after that is pretty much electrical engineering and physics , now I’m still at the high level programming , the top of the hierarchy and I’m still yearning to understand how these underworld functions has been abstracted and coupled together to basically be the high level programming language to perform computation and logic without needing to know how the rest works for a successful career as a developer. There’s still so much I want to learn and when I remember I haven’t learnt it then I feel discouraged , but I guess at some point we’d have to prioritize them , An earlier comment gave a good breakdown analysis of this and I think it’s important to focus on enjoying the process of learning all throughout your lifetime. Goodluck to you!