You are expecting too much. Just think about when you were 19.
When I was 19, I was not slamming batting helmets down after hitting in to a double play. I wasn't destroying helmets in the dugout. I didn't smash a bat in to the wall only to have the splinters injury me. I learned how to control my anger and vent in an acceptable manner at an acceptable time. Bryce has not.
Passion is fine. Letting it completely control you is not.