I guess it has to do with your personality. I don't drink all that much when I was younger. When everyone was partying, I'm usually that kid got passed out at the bar table before finishing the 2nd mug of beer. At times I woke up 2nd day by the garbage bin without my wallet and still wondering what happened the night before. As I grow older, the party becomes even more significant due to my job requirement. Many more night out with the clients. I will feel abnormal if I don't go for a drink the night.
Until 4 years ago. Ever since I stopped smoking, having a drink at the bar become increasingly challenging. Having one hand holding the beer mug, I can't sit still without holding a stick of cigarettes on the other hand. Now, drinking become my smoking problem. I feel uneasy every time going for business drinking occasions.
I experienced a similar phenomenon when I quit smoking around 8 years ago or so. When I drink beer I tend to drink it very fast so the only thing I can really do is to not go to the pub at all or if I do, go there really sweaty with the intention of just saying hi and then leaving to go get food on my way home.
I'm afraid I just don't know how to be social without drinking. I have a ton of experience of doing only that.