Hi jigsaw1124!
Glad you're here! Your situation sounds overwhelming, for sure.
i don't know how to live my own life/leave my parents behind
Even in healthy families the transition of moving out and developing an independent adult life can be daunting, but it sounds like you have some pretty big concerns. Would your parents support you if you decided to live independently? Do they understand how you feel about your sister?
We would love to hear more about what's going on if you want to share. This board is full of people that have overcome difficult dynamics and learned better ways of relating. There is hope.
pj