It sounds like you're going through a hard time. I really am sorry. I've also felt anger and aggression towards many of the loser types at my school who are loud, immature and ruin my school experience.

The best thing I can say to do is take advantage of your school counseling services. Talk to them about the crippling aggression you feel and how upset the loud classes make you. Can you switch class periods so you don't have to be with individuals who trigger you? Your school should be understanding and helpful with this.

Good luck.