I could relate. In a tremedous act of willpower I moved far far away from my family when I was 20. At the time I started my own life I was highly depressed, without any mental help and basically drowning in my own emotional desaster. (I am 26 now. Still drwoning, but now with help)
Whenever I go visit my mother's place I feel exactly as you described it above, exactly as I felt when I was growing up. Isolated.
Your parents are not going to change, and neither are mine. If they could, they would have and we would have had a better time growing up.
I can't give you any good advice than to do what you love, don't give up and get a good therapist. Get all the support you can. And set some boundaries with your parents. At least as long as you can't get away from them physically, try to get some emotional distance and don't expect them to understand you. It will only leave you frustrated.
Big warm hug