That happens. I just tried not to let it bother me. Actually many people don't drink, or drink very little. It is my experience that people that tend to probe could possibly have issues of their own, or have been through it with an alcoholic. I also find, and I'm sure I'm not always spot on, that I have a bit of a radar for 'my people' if you know what I'm saying.
It gets easier. Don't give in to the drinking culture like I did a year ago.