My 'best friend' makes me hate myself?

She sounds like a friend I used to have. She could have her nice moments..but mostly she was just jealous of me. We were friends for years and she all of a sudden started saying really hurtful things about me that I told her I was sensitive about (like that I have terrible skin, I have had stretch marks since I was 12, not from being fat, but from very rapid growth spurts and bad genes). And when I asked her to stop she'd tell me to chill. And I could never do it back. That's just not how I am. If you can't say something nice, don't say it at all.
Anyways, my advise to you.. find a new best friend and start pushing her out little by little. Women were put on this planet to support and love each other like sisters.. not to be competitive or rude to each other. Find someone with the same values as yourself (being kind, lifting each other up instead of someone putting you down). If your best friend really values your friendship.. she will start to miss you. And as the saying goes.. absence makes the heart grow fonder.