Is it normal to want to be dead to your family?

I think it's understandable that you feel that way after everything you've been through. But remember you don't have to make any permanent decisions now. Take a much needed break from them and focus on making a better life for yourself. In the long term, you never know how things will turn out for everyone. Sometimes people do change for the better. Even if it seems unlikely now, I wouldn't completely give up on that possibility.