I've read this whole thread and I recognise a lot of other peoples' experiences in my own.
My mother was emotionally abuse, my stepfather was an alcoholic - with all that involves, aggression, unpredictability, and being sexually innapropriate with me from about the age of 10 or 11. I spent until the age of 16 when I moved out, terrified he was going to rape me when pissed, so from 14 onwards I lived with my boyfriends family, who thankfully were aware of the dangers at home from what my boyfriend told then, and let me live with them pretty much until I was 18 and moved out 
I am so grateful to them, I would have a lot worse to tell a psychiatrist if it wasn't for them taking pity on me.
I told my mother when my stepdad began making 'dodgy' comments to me (about my body, things about sex, telling me how my mum liked it in bed, porn etc) and she told me to stop being so sensitive and prudish and so on. I'll never, ever forget the way she pushed it all under the carpet. I was sexually abused by an older child when I was little and she wasn't interested in that either - to her it's just silly old ManicPanic making a fuss and wanting attention (I am actually very shy and hate attention being drawn to me - it only leads to trouble). I'll never forgive her. She is / was a very very cold woman who genuinely doesn't 'get' compassion or that other people's feelings matter. I have found out she has lied to me all these years about who my bio dad is - I contacted the guy who she said was my dad, he was very sweet and understanding but still afraid of her, he was scared that she would send him hate mail (he was dying of cancer at the time) and he asked me not to tell her so she didn't make us stop writing to each other! He told me she was a complete fantasist who would twist her version of reality to be what she wanted - I had been thinking the same thing so that made me feel better!
Cut them off when I got pregnant with dd and understand maternal love - I genuinely thought everyone hated their kids like my mother hated me... 
My life is infinitely better without their shit in it. And I know my daughter is safe from them. I am ostracised from the whole family but I couldn't care less (hurts sometimes though).
I too am of the mental health ishoos. Huge anxiety, years of addictions, currently having a second bout of depression, on medication but determined to feel better about myself and live the life I want to lead, finally.