You were being bullied to the Nth degree, and you had every right to punch a hole in the wall. I am surprised you did not bust up his speakers. For a 24yo. he was acting as if he was 4yo. He needs to grow up. Only solution is for you to move into your own place away from all that immaturity and depression. You will never be able to control your anger in that kind of situation, it is not humanly possible for anyone. You showed good control as it was.