I know your pain. I know it seems insufferable and eternal. It isn't.
You're in a very dark and unhappy place right now and that place is agonizing, but you can come out the other side. Life is a series of cycles and there's eventually an up for every down.
Once you achieve some fiscal independence and gain your freedom from your parents, most of the stress and misery you're experiencing right now will dissipate.
You've got a lot of positive experiences still to be enjoyed, don't rob yourself of those by giving up before you get to them. You can be stronger than you realize you can be, just hold on and keep working toward escaping the situation your life is in, not from life itself.
BTW, don't let any bully ever make you think AS isn't real. The whole reason this website exists and is so successful, is because there are many, many of us who come here to share our thoughts and feelings about the difficulties that WE ALL SHARE. We can't all be imagining the same disorder. I was dealing with these handicaps for more than forty years before I discovered they even had a name. Being nameless didn't make them less real.
Because my disabilities didn't have a name, I, too had to deal with family, teachers and employers who thought all my problems were imaginary and I was just a lazy, stubborn slacker when I would try to tell them what I was experiencing. In spite of their lack of support, and my struggles, I managed to have a life of my own and a career doing something I loved. It was never easy, but it was worth doing. Your soldiering through this horrible patch will be worth it, too.
Keep focused on the next step, the one that will get you away from the people and things that are holding you back and keeping you down. Do not listen to them, they are ignorant and closed-minded. Don't allow their dreadful attitudes to steal your hope and your creative energy. You've got better things to do than listen to that abusive nattering.