What should I learn at 14?

So, I am 14 and I have ADHD, and I am extremely lost on what to learn and what to do.

I spend countless hours on self improvement videos and how to better myself. But, I am always confused on what to do. Should I read books? Should I do the gym? etc. I also am always starting something and giving up. I really want to break this loop and I really want to build a set of skills. Please help me with this, and also give me skills to learn that would benefit me in the future. For ex, learning how AI works.