I'm 25 years old and collect video games (over 500 atm)
I play warhammer (once every week/2 weeks)
I play magic (not much lately)
I play ADND / Vampire (once a week)
I play FPS games on pc
It's got geek written all over it, but I'm not having trouble with the girls. Even though I'm currently without a gf

But the key is to keep things seperate. If a girl doesn't like gaming it doesn't mean she can't be your gf. My previous gf didn't like gaming, but we still made it work. I'm not so addicted that I have to game even when I was around her. She likes stuff I don't like and vise versa, so she did that shit while I was gone and I did the same.
If you have your collection on shelves in your living room then you might have trouble when girls come over. But even I keep my collection in boxes atm (cause I still have to put up shelves, which will not be placed in my living room).
But there is a way to get a girl who doesn't game to play one. When the weather is shitty and you're stuck inside, suggest a game of Mario. But don't suggest this on a hot mid summer day, or a saturday night.