Sorry for the super long title. Had to have it make sense somehow! 

So, I've been comfortably out of the closet for over 5 years, but as any lgbtq+ person knows you have to keep coming out whenever you meet someone new. I live in a super accepting country, and personally have never met a homophobe. But somehow, I have a huge amount of anxiety about having to come out over and over again. Generally, I am not afraid to tell people I know I am going to be friends with, but I struggle with telling random acquaintances, classmates, coworkers etc.

I have this ceremony coming up at my college, and I go to a tiny college so it's a small gathering. I'm so excited to take my girlfriend! And I want everyone to know she's my girlfriend, but I'm sooo anxious about it. In the past, random people I met assumed my girlfriend was my sister or my cousin which was so humiliating, and we do not even look alike. I like introducing her as my girlfriend but it is nerve wrecking to me as I always feel like they instantly judge me or put me in some kind of box. I'm far from the only gay person at my school but somehow I feel like everyone is going to stare and judge.

I have not told my girlfriend about this. She is really extroverted and I do not want her to think I am ashamed of her. Sometimes she has a hard time understanding my anxieties considering she's super confident and extroverted. I used to have a super hard time expressing affection in public but I've gotten better at it. My therapist just does not understand me either.

Anxious gays of reddit, any advice?