I know - I'm being a selfish child, and I need to grow up....but
You find a song, research it, become very intimate with it, sing it, bond with it, own it....and then some-one from your folk club thinks "that's a good song, I'll have it for my band"....and then you feel sad, because it has an edge of infidelity...and besides they might do it better...

Oh dear, am I alone?