Dear 100 Hour Board,
All of my coworkers drink often and I want to spend time with them and be friends and stuff. How do I drink without drinking?
If it was an after-work-going-out-for-a-couple-of-drinks-each thing and I wanted to go felt like they were pressuring me, I'd probably do something funny like ask for water on the rocks. Something humorous but firm. People should be willing to respect that.
If it's the kind of event where people are getting really drunk, I'm not sure. I have never been a fan of people when they are drunk for reasons so I probably wouldn't bother. But if you don't mind it and you want to make it work I think Luciana's advice is pretty good.
Volunteer to be the designated driver.
I'm in the same situation as you, and so far that has been my solution. If that isn't a valid option, then see if you can find someone else who isn't drinking, and spend most of your time with them. That works for me too.
If it's any consolation, seeing how your friends and coworkers act when they're drunk is surprisingly entertaining.