I've never been really interested in drinking. (DOC is heroine, 8 months sober)
When hanging with my group of buddies, everyone automatically knows I'm designated driver. I always liked being the one people could count on, and enjoyed staying sober to watch the dumb stuff they all do! Sometimes I'll try to drink, but after the first Smirnoff or winecooler, I feel icky and my stomach hurts, so I'll stop.
They all smoke pot, too, and same thing there. I am the only sober one in the room, and it's always been that way.