This is not unnatural at all! A lot of people have a preference. My sister is white and she will date only hispanic males.
If you are attracted to hispanic females, then so be it. Nobody should accuse you of being "wrong" for liking what you like, especially yourself. I say more power to you and don't worry about it.
Besides, our nation is becoming more of a mixed based society anyway, and i, for one, think it's great! :-)