Congratulations on a very tough decision. It's very hard being the only sober one at a gathering. For me, I try to just watch my friends as an objective outsider, and I wonder to myself how I REALLY act when I am drinking with them. Sometimes it's an eye-opening experience to realize how stupid and obnoxious the alcohol and/or drugs can make you. And then waking up the next day with no hangover is a nice reward. Hang in there- It can be lonely, but your true friends will support you.