Can't step out of my comfort zone?

Hi everyone, I'm a 14 year old artist and I've been drawing for a while, however after doing a lot of my own thing and not really studying or practicing the basics of art, I really want to start improving. However, I can't sum up the courage or discipline to study anatomy or proportions or anything like that. I also have ADHD and it's incredibly hard to just sit down and focus. Does anyone have any advice?