If you decide to leave then you decide to leave. If you decide to stay then you decide to stay. You most likely do not need assistance making that decision.
You need help in making sense of your family ACTIVELY making the decision to sever contact. That is what the difficult part is for us born ins. You can say its not a lifestyle choice if you want but your choice of being a free person has nothing to do with their choice of shunning people that dont agree with them. They have made their decision and are being true to themselves. You can get help in trying to make sense of it all but make no mistake about this..... Your family and friends are cutting you off if you choose to leave, not you. YOU are not doing that. It seems like you already understand that they will cut you off but you dont want to accept it.
Simply put, you have to come to terms with the consequences of either action and the very real stress that will come with either decision. Now you just have to deal with those consequences. Therapy, friends and this board are all good outlets to help you figure that out.
pbrow