Don't know how it is in your state, but your income would probably double if you moved out on your own. Like Kimmy said, HUD would be a good answer. Here in CA, HUD pays for part of the rent.

You can change your life. It may be difficult but it's not impossible. Again I encourage you to talk to your T about what your mom is doing with your money. Also, contact someone from SS and tell them you want to change your payee. If there's no one in your family you trust, they'll appoint someone through the courts.

You can do it!