I have a woman who's a bit like that.
1) I fell like she has very little trouble getting boyfriends. Decent guys, too.
2) It's cute and even though she's a platonic friend, I gotta admit it's a tad bit sexy. I can be a man around her without her freaking out or ignoring me.
I can frag grenade a Covenant alien and when he dies it's cool. And she could probably whoop my butt at Halo, but she's cool enough to admit when her characters get killed by mine.
She's cool enough to be seen in public with me without worrying that some stranger might think we're dating, and she makes me laugh, and I make her laugh, and this is laugh as in "almost gotta pee my pants full blown snorting laughter." And she's not always worried about what others think about her.
And yes, she can be a little girly, but believe it or not, in a positive way. She does makeup and her hair. She looks nice. But she's just a cool person.
During an especially rough point in my life, she was one of two women friends who weren't talking about me behind my back in nasty ways, or butting in inappropriately. And when I make hard decisions, but do it right, she can actually admit it.
It's awesome. I can talk to her. I can pick on her, and I don't have to feel like I have to be a different person around her.
But, I'm a bit of a nerd myself, so I suppose I'd find that stuff in general a little sexy if a girl/woman can play video games or quote Monty Python or go to a sci fi convention.
Perhaps the problem is 1) Most of the nerds I'm sure would find you attractive just because you're cool and have similar interests. 2) The people you like hanging out with. you characterize them as nerds, so they're probably a bit awkward around others. some might be a little intimidated with you, so they won't ask you out because even though you're like them, you're still a girl and they know girls will most likely reject them. 3) Your friends aren't going to look at you as attractive in any other way than platonic "Oh yeah, she's great" because you're their friend, and not all of them think of you as a datable woman. It's an established relationship that might be hard for some to break. I know I have the bad habit of accidentally calling one of my woman friends "man" because I think of her sort of as one of the guys, and the "Later, man" escapes from my mouth. 4) You're probably considered one of the nerds. So to anyone that isn't a nerd, there's probably not the level of compatibility. You don't go for the jocks, so they're usually out.
You claim to be nerdy. So find a nerdy guy. Now, like I said, this is a lot tougher because a lot of them are going to be very shy. That doesn't mean there isn't an interest, it just means that they're socially more awkward, and so they won't all come up to talk to you.
You might consider asking out guys you think are cute, or flirting more with them. And with nerdy guys, you'll need to be more aggressive in your approaching.