Omg... this brings up sad memories.
I have a friend that is in the exact same situation with you, only she was in depression. It got worse, and her family thought that it was because there was something wrong with her, so they pressured her even more, until she tried committing suicide. Twice.
Now, I don't want you to go through the same process, so I want to offer you a way out (but it might not work). Please note that these tactics should only be used if there's NOTHING else that you can do, and if your mother DOESN'T agree to get the opinion of a 3rd person (a counselor, a psychiatrist, etc.).
Here are the dangerous tactics that I propose:
1-) Building Up Your Freedom
I don't know what your mother's do's and dont's are, but try doing something in the limit (like something that she would barely allow). If you can do it more than a couple of times, you might be able to make the limits a litle more elastic, and may be do something a little further in the limit, and so on.
Again, I don't know whether this would work with your mother, but you might want to sacrifice every privilege and every property you have in the house, and go for an open riot where if you manage to get out of the house, you return whenever you want, however you want. You will most probably get grounded and punished for this. (That is why I said you should sacrifice every privilege and property you have.) In the end, there will be a point where you have nothing to lose and everything to gain, and vice versa for your mother. It will be very hard and you will be grounded/punished for a VERY long time, but you might succeed.
Again, Tactic #1 is what I used to do with my mother, and it worked for her, but it may not work for you. Tactic #2 is what my suicidal friend did, and it worked for her (after 2 long and painful months though), but it may not work for you.