Want to learn everything, but it's not sustainable, how do I balance my situation?

Hi everyone!

I’m a senior in high school and I can’t control my desire to know/learn/do everything.

I want to master all instruments, become a polymath, write novels, learn 20+ languages, learn to code, play all sports, travel the world, and everything in between.

Not that extreme but you get the idea haha. How do I balance wanting to constantly learn and improve during every moment of the day? Whenever I’m not doing something or lounging around or hanging out with friends or family, I mainly think about how and what I could be doing right now to improve.

I think it began as I started thinking about college as a sophomore in high school and started taking classes more seriously. My study habits and grades stayed close to 100%, but the desire to keep learning kept spiraling and picking up and now it seems like that’s all I do and I don’t really have to for myself. Hell during the college application season this past semester (June-December), I maybe hung out with my friends (besides sports) maybe 5 ish times.

It’s genuinely mentally stressing and I have been getting roughly 5 hours of sleep each night to just learn. I know this isn’t sustainable and it’s bad for my health. Often my head begins to ache after a certain amount of time. 

My learning is also messy and cluttered, as in jumping from one topic to the next and the thing I hate the most is that I can’t retain all the information whether from articles, lectures, books, or whatnot.

What can I do to ease this mental duty that I have placed on myself? 

TIA!