Im goin to a party and i need help!?

ok im goin to a party in 8 days. a lot of the people at this party (and my friends) are spanish and black. natrually, they are very good dancers. well, im a lil white gurl who natrually dosent have very much "rythm". well, there is going to be hip hop/rap/r&b playing the whole time, not to mention grinding! lol and i really want to dance but when i try to dance like that, people think im bad at it. when im actually dancing good, people say im dancing like a slut! can i have any tips on how to dance like that (some of the artists that will be played- soulja boi, plies, lil wayne, chris brown, etc.) i also wanna learn how to grind good. haha ok please tell me how to dance and give me tips! thnx ;D