I don't drink any more, due to medical reasons (epilepsy)
I don't miss it because I was diagnosed in my early 30s, by which time my life was in a different place to my wild and crazy 20s. If I'd been diagnosed then, I would have felt VERY left out, as my friends and I had rather, shall we say, hedonistic weekends
I will have an occasional drink (eg at a wedding I had a glass of fizz in the pre meal drinks bit, and made that last a long time, mainly just to have something to hold!).
But mostly I don't miss it because drinking isn't a massive part of my life now anyway - my friends all have kids, and DH and I stopped drinking entirely during 2 years of non stop fertility treatment, so we v much got used to it.
I drink a LOT of sparkling water - tonic water on its own is undisguishable from a g&t or v&t (and it's harder to drink as quickly as you might a half of soft drink).
If you really want something that's properly booze-ish but non alcoholic then Seedlip is supposed to be quite the thing, as a PP has said
www.google.co.uk/amp/s/amp.theguardian.com/lifeandstyle/2017/sep/10/non-alcoholic-spirits-adult-cocktail-booze-free
I don't miss hangovers at all, that is a massive, massive plus
I will still buy a round because I don't want to be a stick in the mud just because I'm drinking soft drinks, but that's personal choice
Good luck!