I feel as if I am going to explode with anger.

I've been bottling up things for so long. I think it has to do with the fact that I never stand up for myself and just let my sadness and anger seethe. I just feel like hurting everyone who's been mean to me and taken advantage of me. I feel like throwing things and hitting people. I'm so angry, for everyone else it's so easy for them to let their emotions free. but i can't do it. it's so frustrating...