Remember how it felt during the months leading up to your high school prom? Ignore this question if you were full of confidence, aware of who you would be going with, sure of your appearance, well-practiced in your dance moves, etc. But if you come up with words like "awkward," "nervous," "fearful," "panicky" and other synonyms of that ilk, then welcome to the world of the seven young adults in the musical How to Dan…