I Feel So Ridiculous When I Try to Dance… Even When I’m by Myself in My Room!?

How does one fast dance? Like, I can swing dance and ballroom really well, because people taught me steps and moves, but I have *zip* experience in fast-dancing and always feel so ridiculous, even when I try to practice alone. How can I get over the fear of looking ridiculous and “let go?” I don’t drink alcohol, and there won’t be any bumping or grinding at the dance. It’s a new year’s Mormon Church dance. Help!