God, for some reason I'm really super pissed off about this. Maybe because my wife's Dad is like this. Pure D prick.
If you move out and can prove that you take no financial benefit from them you might be able to legally force 'em to stop claiming you. Sorta like a minor being declared emancipated. Oh, and you look damn pretty to me. Very happily married and in Iraq right now, so definitely not trying to hit on you or anything.
No guy could love you as you are? Oh my God, how can they claim to love you and say such a horrid thing? That is no joke the worst thing I can think of to tell someone. That to me removes the gloves. It's cold and calculated to make you feel so worthless that they can control you. They try that again, point out every thing you can think of they are ashamed of, every stain on their character, anything. Or just cut them off. "If I'm so worthless and you're so wonderful, I won't sully you with my presence. Call me if you ever grow up."
They are attacking you; it may be with words instead of a knife or gun, but it's still an assault. If two people who were physically larger than you tried to rape or abduct you, would you gently try to make 'em see the error of their ways? Hell no, you'd rip off ears, crush balls, gouge eyes, stab, shoot, anything. That's how I see this; do anything to stop the assault. Your most important weapon is belief in your own value; they've tried to rob you of it. Take it back. Have no more sympathy for them than for a rapist who ends up in the morgue.
Again, this is an extreme approach, but what you describe is abuse, pure and simple. I hate to say it, but you need to realize THEY DON'T LOVE YOU! They are incapable of love for anything but themselves, just like the parents who beat or molest their children. The only thing that matters to them is themselves; you have no value to them aside from their own twisted ends. Money is not worth being destroyed inside. Maybe they'll change some day; for your sake I hope so. But you can't force 'em to do that. You can only reject their lies and refuse to let 'em attack you.