Is this the right thing to do?

Ok, so today all the 8th graders are going to wild rivers, all day. I had my parents sign the permission slip, but now I don't wanna go because I have a hairy back. You know how kids are nowadays, they ridicule you for being different. I hate shaving my back because it's nearly impossible to do. Also, I wanted to go buy some nair or something, but I put it off to long. What do you think I should do?