Being forced to dance what should I do?

I have been a dancer since I was 3 years old and have enjoyed dancing until about 6 months ago. I have lost any desire or interest I had for dancing. I have a deficiency in vitamin D but my numbers have significantly improved in the past few weeks. My parents on the other hand believe I don't want to go to dance because of this health issue. But due to how my energy levels are up and I feel completely normal I disagree. I don't like going because I have lost interest. My parents and I have had many arguments over this usually ending in them screaming, throwing things, and hitting. They also make the excuse of how I shouldn't quit because of the health state I'm in and say things that don't make any sense such as: your vitamin levels will come up when you go to dance class/ rehearsal every day for your usual 4-6 hour schedule. I understand it might help because of the exercise my body needs but I can get that by any other form of exercise like walking/jogging daily…

Added (1). I have come to a case where I refuse to go or get ready/dressed for dance class and my parents threaten me in taking away all of my belongings and valuables. I became so desperate that I let them take my iphone if it meant I didn't have to go back.

Added (2). They blame me for things like a car accident (my mom ran a red light because she was yelling at me and not paying attention at the road.) Or when my mom smashed my phone on the wall and was mad because she cut her hand on the broken screen. They saw that it did not bother me and threatened to send me to a mental hospital for refusing to go to dance class.

Tell your parents straight that you are not happy