I have experience with that. My family wasn't going to change and I could no longer endure their abuse. I legally changed my name and moved. This wasn't an easy choice and was also quite painful. And, while it won't undo the damage already done, it will certainly prevent further abuse.

I would also like to point out the importance of having a good therapist (and support group) during the transition ... You will need their support and validation to help you through all the emotions that are sure to arise if you choose to take this course of action.

Sincerely,
Pfrog