Well I think maybe you ought to have a word with the bloke organising the session and telling him you want to sing. And when its your turn, you should tell people - please don't accompany me - its not what I like to do.

Most sessions are fairly respectful of the contributors wishes and feelings - sometimes too much so, and its rare some bugger doesn't turn up and try and stretch the envelope by making insane demands on the listener.

Perhaps you should wear a large badge, saying 'I am an unaccompanied folk singer, Gissajob! My singing is wonderful! Ask me to sing!"

No point in being backwards at coming forwards. After all that's what you're there for.