audition for a musical

I would love to be in a musical but not as a lead my family say I can’t sing and when ever I open my mouth to sing they say things like stop singing it sounds like cat dying…when I know it doesn’t because day after day I sing..I hate it when you build your confidence up about something you enjoy and the people you love bring you down every little bit at a time until you totally give up on things but this I will never give up on I hate my nose because of the shape and size and loads of people take the mick out of it and I get really upset because of it..I’m only 15 and I have really big aspireations (not sure if that is the right spelling)