How do i just relax when i go to a dance?

i am going to a dance on this Saturday night with this youth group who is hosting a regional dance for teenager my age (high schoolers). My first girlfriend i have ever had (of 3 months by the way) broke up with me last week and i am going to try to meet some new people, and maybe some girls. The thing is, I have never been a person for dances. I am vey shy, however, recently, i have had a lot more self confidence. However, i know just like my old self, i'm going to want to just sit on the side. I dont want this to happen!!! i want to have fun, but i just dont know how to. i dont know how do just calm down and just go with the flow. Help? thanks!