Out and Proud?

So for those of you who've been reading this blog (yes i know, not many haha) you know that I am pretty comfortable with my sexual identity. I made the decision to come out two years ago after graduating college, and since then, I've become increasingly comfortable living in my own skin. I had no problem telling people in med school that I'm gay, and when people would ask, I wouldn't deny it.
But for the past month during rotations, I think I've been finding it harder to tell people that I'm gay. And by people I mean the people I work with. Of course my classmates with whom I rotate know, but none of the interns/residents/students from other schools/nurses know. So whenever they make a comment that assumes that I'm heterosexual (ie "oh you'll understand when you get a wife") I don't make an effort to correct them. I think underneath it all, I'm afraid of the fact that my superiors or the people I work are actually homophobic, so they'll treat me differently when they find out that I'm gay.
Is it wrong of me to not correct them and tell them that I'm gay? Am I not proud enough to declare my sexual identity? I guess I'm also frustrated that people automatically assume that I'm straight because I'm a guy who doesn't act or dress flamboyantly. As health care workers, shouldn't we be more sensitive? I mean, in med school, we're taught over and over again never to use questions like "do you have a husband/wife?" because it assumes the patient's sexual identity and can possibly make them uncomfortable. Well if that's the case, then shouldn't we apply this idea to everyday life? Maybe one day people will be more aware of these differences. And maybe one day, I'll be brave enough to correct others.