I'm so sorry. Parents are meant to be supportive and when they turn on you it's as if your entire foundation is gone.
The thing is, your Mother is not your only hope. We are not your only hope. Even though many are happy to be supportive here. You are your only hope. You are the one who discovered the truth about yourself. You are the one who was brave enough to go to your parents and tell them what they didn't want to hear. You are the one who is standing his ground.
Clearly you are strong enough to survive this. It's not going to be easy but you can do it. In time, you will find people outside your biological family who will appreciate you for who you are. Not for who they rather you would be. Parents tend to have a predetermined idea of who you are. If you break that, they get upset. It's their fault for planning out your destiny for you. You deserve to find your own path. Don't let anyone else plan it out for you.
Just keep putting one foot in front of the other. You will get there, I promise. Just hold on.