From what you wrote here it's obvious as to why. Your Mom is letting him be this way and allowing him to abuse you. So sorry to be blunt guy but your Mom chose this dirtbag over you and as far as I'm concerned any parent that would choose a partner over there own blood is worthless.
Seriously the advice given here so far about moving out and getting your own place is great advice. To me your Mom is just as guilty of this abuse as her dirtbag boyfriend because she allows him to abuse you. If I ever got with a woman who had a kid, I'd love and accept the kid as though he/she was my own, and I'd never abuse them.
Sorry you're having to deal with this.
He is a bullying insecure male who thinks he has to get rid of any other male in "his" territory. Your mother is siding with him. I think you can't win this one.
I would look for a room-mate situation and move out, or maybe there is other family that can take you in. I am sorry you have to deal with this problem. Your life will become easier away from him.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.