Controlling mother

Help I really need some advice... Funds are tight so I decided to do College online and live at home. My mom also is having some health problems and really needed me home to help out which is why I partly decided not to go to college campus. However she has always been super controlling, this is partly because I'm an only child and also because she's very conservative and strict. I am 20 years old and I'm not allowed to have any social media, I barely have any friends, and I cannot go anywhere besides work without letting her know why or getting guilt-tripped for it. I have no social life I would never be allowed to date or go out or do anything with friends. Today I put on just a little bit of light mascara and my mom told me I'm not allowed to wear any makeup when I living in her house because I look Gothic, which I totally did not and I buy my own makeup... While I understand I'm living in her house, I feel that these rules cannot be held above me and she does not recognize that I am an adult. I'm forbidden from having an Instagram or friends even though I'm the one paying my bills or purchasing items. I feel trapped I cannot move and I don't want to right now as she really needs me because of medical problems but I don't know what to say to her since she is not open minded whatsoever and insist that if I stay in her house it's her rules