you know, i felt pretty asexual until my mid 20's. that isn't to say i didn't date or have relationships-- i did. it's just that no one really knocked my socks if, if you will....
men were masculine and nice to look at; every once in a while, i would get a crush on a girl. but nothing seemed to fit. then, one day, things just fell into place. i realized where my strongest emotional connection was-- and the sexual attraction heated up towards that group immediately.
maybe you are just still growing up like i was. what will matter long term is how you respond to the people you do find attractive. for myself, even now that i know i'm gay, it's not every day that i meet someone and think, "wow! hottie." maybe you just haven't gotten there yet, either.