What can I do about my mom? I'm gay. Please help!!!!?

Study your *** off and get a scholarship, or at least study well enough to get a decent job with upward mobility, and get the hell out. Three years may seem like forever, but just focus on doing everything you can to be independent as soon as possible. And if you can, move in with your aunt. If your girlfriend is a good person, she'll understand that you're a minor living with a freaking psycho family, and that you've got to do whatever will make your life easiest until you get away from them. If she cares for you at all, she'll at least help in anyway she can to make your life with your crappy family less crappy, even if that means ignoring you for awhile. She may not want to wait until you're free of your family, but the least she can do is be a friend while you're trying to make sure you never have to listen to what they say once you're an adult.