One of the best performers I have ever had the pleasure to witness once said the single most sincere statement I've ever heard spoken to an audience.
"If you wake up and you have enough voice to say 'Good Morning' to the first person you see tomorrow. You did something wrong here at the concert tonight."
You have to sing and scream and let your whole being erupt through your throat with the ferocity only your inner-most being possesses. If you don't let yourself impact the world around you, then you aren't living. If you don't let the world impact you, you're just dying slowly and alone.
So sing. Let your voice roam so free...it gets lost.