I've found myself interested in white guys but I never pursued them because 1. I was intimidated and 2. I didn't think they would be attracted to a black female. I'm 6ft size 4 and pretty if I say so myself. Are they attracted?
Some guys are and some aren't. I personally am attracted to all races and ethnicities. I've heard that in terms of evolution, people in general are attracted to people of other races because it promotes a mix of genes in future generations, causing them to have a more diverse immune system and be more likely to survive.
That's the nerdy scientific explanation, but really it comes down to personal preference. Don't be intimidated, it's just like going up to any other guy.