To be physically fit is just a small aspect. You can be a beautiful physical specimen, but you're empty as far as what it takes to be a person, and that shows up real fast.
I think being mean to people in high school is healthy. It's sort of like you're in this situation with all these other kids and sometimes you need to get your aggression out. And if you'd had people be mean to you before, it really does build character.
If you want to study writing, read Dickens. That's how to study writing, or Faulkner, or D.H. Lawrence, or John Keats. They can teach you everything you need to know about writing.

