Cohiba, I don't really blame you for doing what you did. Its important to get along with your co workers etc...At least your mad about it, and that's a good sign. You'll start right back up tomorrow.
By the way, believe it or not if you would have stood your ground and had not drank any alcohol when first offered, your coworkers might have razzed you a little and been bummed out but I bet in private they would have respected the sh*t out of you.