I feel a little out of place with my girl friend's friends?

I am 26 and have been dating a great girl who is 28. When were together, the world is our oyster. We do everything together and have our rituals Monday night pro wrestling). She is also a party girl, so when we go out I often feel that her friends (mostly gay men and a few guys that are straight, but questionably gay) just accept me there because I am the "boyfriend". That maybe deep down they wish I wasn't there. We went out last night and everything was fine, just kinda felt a little out of place because my girlfriend is the center of attention and i always wished we could be like that duo, but one of her best guy friends (the possible gay one ) has that title. Lets just say when she was dancing on her friends and dancing on one of the gay guys I just wasnt feeing too happy to be there. So should i just accept it or should i stop it. I mean i know it her friends i know they are gay and one is very femenine but says hes not, idk if i should feel like ok should i even be here. I mean she never dances on me.