I'm the worst dancer in my class?

Ok, so I just started dance class (contemporary) and even though it's a beginner's class everybody has had at least a little bit of dance experience except for me. My movements aren't fluid and when I dance it just looks horrible. Worse than horrible. I'm willing to practice as much as it takes but I don't really know what to practice just to move better? I'm pretty tall-not super tall though and kinda bony (elbows and knees and such). It was a really embarrassing experience and I have two weeks until the next class-how can I prevent this from happening again? Oh and I'm 14 if that helps at all....thank you!