Heh, don't feel too bad - two of my good friends have been dating since the first week of college 2.5 years ago, and his mom STILL introduces her as "Kyle's friend Alicia". And I've been introduced as Justin's "friend" a time or two as well.

So yeah, it's not just a gay thing - it's a parent thing. And it's obnoxious. It may also be that your dad doesn't feel comfortable outing you to strangers, figuring that it's your business if you want to tell them. :: sigh ::