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I think you should do what you feel is right. If that part of you that knows what you want for yourself and your future is set on one thing, than I honestly believe you should go for it. Sit down and talk to your parents about it if you feel comfortable with that, go to a counsellor.
My mother was in a pretty restrictive relationship with my father for a long time, and a couple years ago she broke it off with him and went back to uni to pursue dietetics actually, now she's being offered a PHD and a job at a university, and she's much happier for it. It kind of cemented my belief that if you feel your relationship with someone is unhealthy, or its making you unhappy, you seriously need to think about their role in your life. I (and I might be totally of with this, if it offends you im sorry) believe that if it makes you unhappy or unsatisfied with your life than your parents should want to try and help you be happy, and if they don't, than you might need to consider where you honestly want to be in the future and go from there.