Since when does being white mean you can't dance?
The only thing I can think of is if you want to dance to ....*ahem* rap "music." Or that you want to dance like a rapper.
If that's what you want I wouldn't recommend it. Like oil and water, rap and the white man don't mix.
Rap music is, as far as I can tell, explicitly black culture and anyone who's white who tries to get involved is simply a wannabe. Even if not, that's how they're going to look.
Other than that I'm sure there are many different types of dancing you can learn. One of the first things I think of is slow dancing, which you can probably do with no problem at all.
Side note:
As you can probably tell, I don't think rap is music. It's unpleasant noise. Plus, the things I say about it being explicitly black culture can make people think I'm racist, I'm not. I do have a friend who's half-black, and he likes rap music.
Man, do I ever hate having to be politically correct, else risking resentment being directed towards me.
Ben