Is it normal to not care about romance?

I have never been interested in women. Before any trolls pop up, no, I'm not gay. But, as far as I can tell, I'm not straight either. I'm huge next to my friends, and sport a full beard, so obviously we've got some testosterone kicking in. It actually happened once that a girl was flirting with me, but I didn't notice because I wasn't interested. My friends are all puzzled by this, as am I. Whenever they encountered a girl, they'd leap at the chance if they thought the girl was "freaking hot" enough. I'd look over and go "Meh." and go back to the previous subject of conversation.

I've never met or even heard of anyone like this. Is there someone like that?