I find it is much like quitting smoking. There were times when I had to take each and every minute as they came, but not one minute without alcohol or cigarettes has ever harmed me in any way shape or form.
Try not to think about such a big picture. Enjoy this moment in time. When you get invited to one of those parties, just go. Nobody will force booze down you. You will just elect not to drink then as you elect not to drink now.
It doesn't hurt. It's not uncomfortable. It's life. Enjoy it and live it.