Should I drink to fit in at work, or not drink and look weird?

Don't drink. It's just silly to drink something you dislike just to fit in. Your co-workers will get used to you not drinking. I had a similar problem when I became vegan and I would go out with my new friends and they all ordered meat dishes and I sat there nibbling on my little salad. But I believed in my choice and principals and stuck with it. Now, however, they all know I don't eat meat and don't even think twice about it, it's just become normal to them too. If they're really such nice people they probably don't mind when you don't drink and if they do hound you then they aren't very tolerant. Don't worry you'll get over the awkwardness after a while (especially once you get to know them better and become more comfortable with your co-workers)