I am white but i exclusively feel attracted to biracials and latina's?

Hi, I'm a nearly 21 year old white caucasian guy and I ONLY exclusively feel attracted towards mixed race and latina girls. I just think they are gorgeous and exotic. I don't have anything against white women or full blooded asian and black women, and I see their beauty, but they just don't attract me in a sexual way. Not even really tan Italian or Spanish chicks do it for me. I just love that exotic and racially ambiguous kind of look on a girl. White girls (and black, asians) just don't turn me on, no matter how 'beautiful' they are.

Is this normal? What do you think?