I don't over-sing anymore, which I used to suffer from terribly because I couldn't hear myself.
Don't worry, be crappy. Revolutionary means you ship and then test... Lots of things made the first Mac in 1984 a piece of crap - but it was a revolutionary piece of crap.
I believe that music is a force in itself. It is there and it needs an outlet, a medium. In a way, we are just the medium.