I had to change my ideas of fun.
I found lots of things to do that didn't involve alcohol - for me that was museums and galleries, coffee places, pizza, movies...other people play sports or get into various hobbies.
I couldn't do much with the friends I had at the end of my drinking career cos they were all alcoholics too, but I reconnected with old friends and made new ones.
Trust me there's nothing worse than that older guy still trying to be 18....
I like being an adult now.
There's a lot of fun and good time to be had sober
D