I'm in the process of doing this myself. I'm considering even going to the extreme of disowning them and getting a legal name change and dropping out of the state once I save up some more money. Most of them don't give a damn about me so why should I give a damn about them?

There is nothing wrong with what you're doing. After all, any person's responsibility should be taking care of themselves first and foremost. If anybody else is a threat to you and your needs, regardless if they are family or not, it is your duty as an organism to fight back even if you must hurt them emotionally or even physically in the process.

I wish you well with your decision