My mom never sees the problem

I’m 21. My sister is 29. My sister and I have NEVER had a good relationship. My mom has always put us against each other. Always said why can’t you be more like __ or __ doesnt do that. A lways punished me but never her and created resentment and jealousy between us. I couldn’t do the things I was interested in because my sister never had the opportunity. I couldn’t even join my aunt’s canoe racing team because she never asked my sister??? I couldn’t have an Instagram when I was 17 because my sister didn’t have one. She tried to keep me from driving because my sister never did. She tried to keep me from moving because my sister never did. Never addressed any of our problems and acted like I was always wrong. My sister had the right to do whatever she wanted to anybody and my mom tries to act like I’m crazy for not wanting to talk to her. Just now my sister is talking shit about me and my mom snobs her and I ask her what that face was for and she tries to act like she didn’t do anything and blatantly lies to my face that she didn’t even look at her when I can see her! Again my sister gets to do whatever she wants and my mom covers for her ass. My mom has been lying to me for so many different things. I’m noticing now that her stories always always always change. It depends on who she’s around. I’m so tired of it.