>instead I do other things during my free time, like watching youtube. I also think reading books would be better for my brain than watching youtube endlessly lol

I do not think books are the universal better hobby, but watching youtube videos for hours is probably not going to lead to any insights into anything or relaxation.

So I guess the answer, just do not watch youtube videos for hours on end. If you want to use that time to read books, fine, if not, if you wanna do some volunteering or exercise or draw or clean stuff, that is also a good thing. Take a breather from spending hours watching youtube videos, that will be a win, whether you want to read books or not.