I honestly don't know how you get over it. Everybody says I look masculine and deems me masculine until they've heard me speak. Then it becomes a question of am I or aren't I? I feel really great when people call me sir or say hey man or something like that...BUT...where I go to school, I use our elevators a lot. So, if I ask someone to help me with the elevator, it really is a mixed bag and I feel crushed anytime they insinuate I am a girl. I have talked to the GLBT org and student govt on campus about gender neutral language, especially amongst school employees. I hope they will do something to make it clear gender neutral language is important.
I had a teacher out me to a class of 500. It was a 200 level class, and usually I tell my teacher, but the class was so big, I figured it would not be an issue. Boy was I wrong. After I asked a question about our exam, he said to our entire class, "Did you hear what she said?" I was mortified. Some in the class know me from other classes know as Dom, the guy. I am pretty much out to many people, but I do not feel every person I meet needs to know, so some don't. He had no right, looking at me passing very well physically and then calling me she. I felt like he did it just to be a jerk.
I had another professor call me sweetie and baby when I asked for help with the elevator. I told him thanks and my name was Dominick. The look on his face, as he turned bright red, was priceless.
Still, this anxiety lingers. Do I correct everyone? Do I make a big deal about it? I don't know the answer or whether we can really ever get over that. I feel it too though and it sucks.