To jazzercise or not to jazzercise???

I have signed up for a free program at the local Jazzercise near my home. I don't know if I can handle it, but I really want to try.....still lacking motivation though. I have new shoes for class, a new water bottle, and new exercise clothes....now all I need is for me to get up and go to class.

will I be the only fat one there? I hope not.......
will others make fun of me? Hopefully not to my face.....
can I really do this? I am gonna try......

The program encompasses class 3 times a week, nutritional sessions, fat analysis, a personal training class, and the motivation to come.....They tell me that if I don't come they will call me.
I have to provide a testomonial at the end about how Jazzercise has helped me achieve my weight loss goals.....God, I need a goal too.......

Goal-to loose 20 lbs.