Hi thundereagle, and welcome to PC. I hope you stick around for a while - folks here are awesome!
There are so many ways to cope with family issues, and none that is a one-size-fits-all. I've spent a lot of time lately wondering how I would handle things if I had no support at all. It's really a black and white answer - I either become my own support system or I give up. I expect there are a whole lot of people that don't have anyone, but still find a way to get by and even thrive. There's a point to this, trust me!
When people we love don't behave the way we want them to, we take it personally, we assume we know the reasons, and we have expectations of them that may not be fulfilled. You don't have to disown your family - it's possible to love them even if they aren't able to give you the support you need.
What you can do is start with the goal of being your own support system--the one thing you have control over. Allow them to have an opinion, listen politely, thank them, and continue to do what's best for you. The more you show that you are being proactive, the more you show that you are accepting of them, the more likely it will be that they will come around.
It's possible that they may never come around; don't take it personally - it's their problem. And since you will have the assurance of your own ability, you can be more tolerant since you have you as an excellent support system.
I hope that helps - and don't forget, we BPs here at PC are a pretty good support system, too.