Why am I intimidated by white girls?

I'm asian guy (korean) and I really don't hold any pretensions or prejudices in my mind. Back to topic, I usually feel quite at ease and comfortable with asian chicks, hispanic chicks, black chicks, and yeah alot of white chicks. But some of those girls, especially the blondes, i don't know what it is....maybe their eyes? lol. now i get along and make friends with Everyone but sometimes I feel intimidated, not uncomforatble.