My skin crawl,

I feel bad and want to have a good relationship with her. Do you think it might be I avoid her because she was extremely abusive physically and mentally to me? I am also diagnosed with ps, anxiety depression ptsd, adhd does anyone else feel this way. And seeing her is I don't have much of a choice because I live w mom and dad and my parents watch her daughter. After spending time with her I feel drained empty and used. I hate feeling this way but I do any advice?