It seems like white guys are afraid to talk to me.. y?

Im an attractive african american female..and sometimes I see some really attractive white guys who I would be interested in getting to know.. but it seems like they try to avoid lookin my way, so they keep there focus straight ahead.. and its strange bcuz usually I get alot of attention from black and hispanic guys.. one day I was sittin on a bench next to this cute white guy.. and i decided to try to start up a conversation with him..he was one of the ones who tried to avoid lookin in my direction..after I broke the ice, he just started talking and smiling and askin questions.. i can tell he was still kinda nervous though.. but I dnt see y, I was being nice and friendly... I mean seriously whats the big deal with race these days.. just becuz im black doesn't mean Im gonna try to bite ur head off if you try to talk to me.. is there a way that I can show im interested in talking to them.. or do I always have to be the one to break the ice?