I'm going to have to agree with ANewStart4Me on this. While your family seems much more extreme than mine, that is one of the primary reasons I didn't tell my family about my surgery. To this day, none of them know. When I realized that my outlook on life and their approach were different, I started keeping them at arm's length.
The only person you can change is you, so you need to adapt to them in the best way that works for YOU.
I also recommend that you consider formal counseling. We're here to vent and give our "Dear Abby" versions of advice, but formal counseling might help you to work through this and develop some good coping mechanisms.