What I did is I told my really close friends that I was quitting using and drinking. I told them that I was doing the twelve step thing. They undertood and that was that. The others I would just tell them not to buy me drinks and if they asked me why I would tell them what I was comfortable with. Some I said just taking a break, others I was on the wagon. I was not the first of my crew to get sober. One of the few, but not the first. Eventually, they all stopped asking and they respected my decision. Those that don't support you, you need to detach and move on. Good luck.