I cut out alcohol in the past month almost completely. When I did cheat (about three times) I had one small glass with a meal. I really believe that this has made a HUGE difference. I have learned to be social without clutching a glass. Bringing along my own drink (sparkling water) has made it less awkward. In the end no one really cares, and you don't need to give a reason.
Don't get me wrong, I still really enjoy wine or a fun cocktail. But I'm saving those for REALLY special moments not EVERY time I meet friends or have a date with my husband.
I have learned not to mirror the habits of those around me.