I agree with those that have said to find a "new" family, that is if you feel it is really harming your self-worth and holding you back in life.
I moved hundreds of miles away........ it's helped me in some ways.
I still hear the ghosts of my past(actually siblings and mother)--- saying, "You're such a loser, no one wants to be around you" and that I'm not worthy to go on vacations-- that's why I wasn't invited when I was little........ but at least I'm not physically around it in person now-- so it's a bit better.
wishing you strength and peace.
mandy