You drank because you wanted to feel normal? Is that how you are feeling now?
Normal for us, and for more than half the world, is sober. You know that is the right choice. It is the right choice now, it was the right choice when you had that wine or beer in your hand, and it will always be the right choice. If these parties you think you are missing are all about getting trashed, then they aren't for you. It's ok, really, because sober folks do funner stuff. They remember it afterwards too!
Make that right choice today, and make it for good. You can do it. You deserve it don't you think?