My mom purpsely saeotage me so I wouldn't leave her... I feel like a loser what should I do?

So after a lot of therapy and talking to family members, I have realized my mom has purposely sabotaged me and my siblings so we wouldn't leave. My mom has done a lot of messed up stuff to us to make sure we are codependent on her from purposely hurting herself, so I would drop out of school twice and allow my sister to be raped twice for weeks at the age of 12 by 20 years old. I was pretty young at the time, so I didn't notice all of this wasn't normal, even though my sister being molested was normal since my mom did nothing about it and even had fights with people who tried stopping it. I was a special needs kid, so I didn't understand a lot. I told my mom about it, and even my stepbrother did, she threw him out. My older brother kicked the first guy, and my mom allowed IT to happen again with a 2nd guy. I won't go into Detail. My mom also got a lot of money for me when I was a kid because of my issues but spent it all on herself. I spent all of my car money once when she got cancer because she refused to eat anything but takeout.

My stepbrother has been telling me new things about my mom every day, and I am starting to see it more and more. My mom often says without her, none of us would be able to survive. I feel like a loser since a lot of girls I dated were so far ahead in life than I am. What can I do? How can I accept feeling like this?
I don't hate my mom since she had a horrible childhood like shit that could be in a movie. My disability makes it harder for me to understand things, just so you all know.
My mom purpsely saeotage me so I wouldn't leave her... I feel like a loser what should I do?
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