You need to talk to a professional about your mental health issues. Your parents don't have the expertise to know what's best, and by now they probably don't have the patience left to deal with your issues. Give your parents a break. Get professional help.
Remember, you are not emperor of the universe, so you will not always get your way. It is not the end of the world when you don't get your way, just the end of your good mood, and the start of one of your tantrums. Dump the tantrums and deal with the reality that you can't always have your way. Sometimes it is the turn for others to have their way, which means it is not your turn then.
_________________
If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau