How to deal with my bitch of a sister?

Cherokeehp
There is a 7 year gap between my younger sister and I. My mom raised me as a single mother, but my younger sister has always had both her parents in her life. My mom was just a teenager when she had me. Growing up for me was rough. My mom always made sure I had a roof over my head, and food to eat, and clothes, and I always went to private schools, but I never really had a very good relationship with my mother. Actually, I was always kind of scared of my mom because she was a perfectionist and was always eager to criticize me and chip away at my self worth. I have a lot of issues with my mom and my dad basically neglected me and I’ve pretty much always dealt with severe anxiety and depression because of that. My parents aren’t the sole cause of my mental illnesses, but they’re definitely the main one. I love my little sister, but she likes to bring stuff up from the past that she knows will start an argument between my mom and I. Or she’ll just criticize me for no reason. For example last night, I was sitting and having a nice conversation with my mom and sister and then out of the blue my sister says “You’ve always been so sensitive, it’s probably because mommy has always been so soft on you”. And it pissed me off and it turned into a huge argument, because everyone in this house is constantly criticizing me, and they have no clue what it was like. My mom treats my younger siblings completely different than the way she treated me when I was growing up. My mom would beat me if brought home grades less than a B, and would throw all my awards in the trash. My mom would constantly remind me that I was ugly and overweight. My mom forced me into sports and activities that I never wanted to do and then called me a quitter and loser when I wanted to quit them. My mom never does any of those things to my siblings. My mom has literally never been soft on me.
How to deal with my bitch of a sister?
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