a lot of white guys like "exotic" girls (asian, black, you name it).
and, not every white girly is blond. i'm very dark-haired and that's never been a problem, even though i don't fit the blond white girl stereotype.
i think that a lot depends on how you think about yourself when looking for a partner/boyfriend. if YOU think you're attractive and have a nice personality to offer as well, then so will the boys. the more insecure you feel, the harder it will be to convince anyone that you're worth a second look...