I read your story and he sounds like a jerk. So he has lied to you and everyone else, is using you for a place to stay and sex, and yells at you, doesn't love you, and has kids he has to pay child support for? Child support goes on his income, not yours so for him to use that as an excuse is just another lie. Dig down and find what little self esteem you have left after this guy has sucked almost all of it out, and get rid of him.
Find a nice guy and try to live your dreams, it can happen.