As someone who has struggled with anger issues their entire life, I understand. The best analogy I've got for you is you're a can or bottle of soda. If something gets you worked up(shaken) it doesn't matter who does it. Whomever undoes that cap is the one getting soda all over them. That said, I know things might be tense right now, but do you think you could sit down and talk about it with your dad? I know the school won't want to hear it, but having someone to talk to really helps. If any of your friends ask, just tell them that you were stressed out, and she was the last straw and it wasn't personal.