It depends on the guy. Hopefully, if he's a good guy, he won't decide if he likes a girl based on her appearance.
If he likes black girls there should be no problem just be yourself
some girls are different some might up liking black people and some might end up liking white it doesn't mean there's nothing wrong with black people just the people not dating them
Its different for all girls, just see what the girl that you love, likes in a guy.
ask them out