I can understand where you are coming from. My father was an abusive drunk, though he has been recovered for 20 years or so now. You can't really forget what happened as a kid, and the dysfunction shapes how you act now as an adult. For me, I can't handle conflict and start crying even though I know it isn't a dangerous situation. My relationship with my father is kind of spotty. Sometimes it is great, sometimes he's off doing whatever for months and there is no contact.
My best advice would be to avoid people that are toxic, even if it is your mom. We went through the adoption process too (that dream is on hold, but that's another story). Even in open adoptions, caseworkers will tell you to cut out visits if the bio parents are being toxic. It sucks, but maintaining your sanity and the sanity of your family is the most important thing. Hopefully, they'll come around and things will get better.
My best advice would be to avoid people that are toxic, even if it is your mom. We went through the adoption process too (that dream is on hold, but that's another story). Even in open adoptions, caseworkers will tell you to cut out visits if the bio parents are being toxic. It sucks, but maintaining your sanity and the sanity of your family is the most important thing. Hopefully, they'll come around and things will get better.