Kudos for doing a month. I’m almost a year alcohol-free and it was after four or five weeks that I really started to notice the difference in energy levels, skin condition and mood.
With friends/social situations, IME you have to completely and unapologetically own it. If you mitigate with the old ‘oh I’m on antibiotics just now’ people just nag you next time and it never goes away.
I usually say something along the lines of, ‘I don’t drink, it doesn’t do me any good,’ and leave it at that. You don’t owe anyone an explanation or an apology so work out your boundary around what information you’re prepared to give out, and then stick to it.
Depending on what you like, there are some good alcohol-free alternatives around. The spirits like Seedlip are ok and mix well. Germany has some good alcohol-free beers, as does Scotland. No one seems to have cracked alcohol-free wine yet, sadly. Shloer is nasty stuff IMO.
Also, it’s worth being prepared for two things: 1) subtle social pressure and 2) weird reactions. For some reason, some people get weird around others not drinking. Maybe it highlights their own issues with alcohol, I don’t know. Just remember that how they feel about you not drinking is entirely a matter for them.