If you really really really want to sing, you could attempt doing it with friends, that way if you mess up it'll be less noticeable, but I highly suggest trying something else. It doesn't matter what it is, just anything that you have a talent with.
maybe you can get some of your friends together and sing all together in a group so it doesn't have to be just you alone singing. make a parody of a song or something to make people laugh. hope i helped! good luck
Make it fun. I can sing but what id do if i really wanted to have a singing oriented show would be grab a few other girls, dress up, and each make parts to lipsing tell me what you want. Just for laughs.