First and foremost, welcome! I've been here since Tuesday so im an expert - feel free to ask me anything
(ha!)
Regarding what I plan on telling people, it's either simply "I don't drink," which plays quite fine here in the U.S. South, or I plan on saying that I'm allergic to alcohol (true in my case apparently...destroys my digestive system). I'm not really worried, though. It's better than explaining why I had 5 beers