I never feel like I'm missing out because I don't drink anymore. I know I can't drink socially. The tough times are usually when it is a social gathering of people I don't know well, but it is generally only the first few minutes that I feel awkward (and that's because I'm not a very social, chatty person by nature).
I always think (omg, if I were drinking I'd be a sobbing mess in the corner or dancing on tables). Never again. :-)