You do not state your age. If you are 21, I do not see how your parents can compel you to pursue a particular course of study or to enter a certain profession. Of course, they CAN cut you off financially and in any other way they please, ie. no contact. Unless you've had an adversarial relationship all along, I doubt they will sever all ties. I think it is up to you to establish yourself as an adult, making your own decisions and taking full responsibility for yourself.
Let me give you an example from my life. I had completed my freshman year of college on a scholarship, my own savings, and a part time job. The classes were going well; my GPA was 3.95. The living conditions in the dormitories, however, were horrid. The legal status, "in loco parentis" had been abolished, leaving the logical conclusion of tossing together about 300 unsupervised young people, ages 17-22 to their own devices. I was not a practicing Catholic, but I found it a moral cesspool, to put it mildly. My roommate felt the same way. Without consulting our parents, we calculated our living expenses and signed a one year lease on a run-down apartment over a hardware store. We moved our belongings in and then told our parents. Mine were not thrilled, but there was nothing they could do or say, since I had secured a full time job in town. My roommate's mother was much more easy-going since this was her youngest child, the other seven being married, moved out, etc. She even came up for a week to help us paint, fix up old furniture, etc. She sent her daughter a monthly stipend to help with the cost. My parents took a harder line. If you're on your own, you support yourself. In retrospect, they admit it was a good move. They haven't agreed with all my life choices, but so what? I'm answerable to God first, then parents. May I suggest you take same attitude?