I play games, and everyone I know knows that I play games. When we have to do those arbitrary introductions of ourselves on the first day of class, it's included in my description of myself. I started grad school a month ago and this is how I introduced myself:
"Hey everyone, I'm Adam. I'm from Loris, South Carolina, went to college at Coker College. Yeah I know you've never heard of it. I hardly have. I like movies, sports, tv, I'm a writer and I'm a gamer. I spend a lot of my free time doing that especially when I need to unwind. So...yeah, that's me."
People know that video games are a part of who I am as a person. I've literally been playing games since I was able to sit upright (my brother is 4 years older than me and got a NES console a few months after I was born, and he wanted someone to play with)
My friends play varying types of games and I play different games depending on who I'm with. I have some friends it's strictly Madden or NBA Jam. Some it's Call of Duty or Halo, some it's marathon runs at our favorite RPG's.
I don't think it's really a big deal, I mean, your personality and interpersonal skills should determine the quality of your social life, not your hobbies really.