I'm the same way. For the most part, I've been attracted to guys who are like me. Light hair, light eyes, tall, college-educated, good family, upper-middle class, liberal (
), etc.
I'm rarely attracted to people who are outside of that mold. At a bar, if there's a group of guys standing together, my eyes will always go to the tall, light-haired guy. That's my type. I don't think there's anything wrong with it. It doesn't make me racist or predjudice just because I'm not attracted to someone who doesn't have those traits.
Look at your group of friends. I think few people can say they have a very diverse group of friends. People are more likely to build a relationship with someone if they have common backgrounds.
I agree with Dionysus that you could be the same race as someone and have absolutely nothing in common. Your geographic location and socioeconomic class plays a bigger part in your personality. I feel that I have more in common with someone who grew up the same way as me.