Hi Tigerlily,
I'm so sorry you're in this situation. From someone who left an emotionally abusive alcoholic family I totally understand. The degree of denial that's present sometimes can just make you crazy!
I agree with what Saw said about standing up for yourself, even if it's just to yourself. Setting boundaries for their behavior and keep trying to tell yourself that what they're saying is not true. Keep talking in t and using her for support and hopefully a place where you can get some of the nurturing and respect you're not getting at home. Also, a support group like Adult Children of Alcoholics (not just for those in alcoholic families, but any dysfunctional family which really could be everyone!) might be helpful for you. I know when I was working on getting out of my parents house, having a sponsor, someone who had been where I am but is in a better place, was so helpful.
I really hope this helps.