It happened to me over a dozen times. I am a sel taught guitarist, just larn to add a bit of backing to my singind. Never reached much if a standard and 'died' severely on various stages. Luckily people were kind enough to say "keep it up" Then like you on the verge of giving up a friend who's part of a very good duo and once had a contract with EMI (is that right?)asked me if I'd do an opening spot for them at a very good club. I was shocked and protested "you know my guitar playing is hopeless" Yes he said but a lot of people including me often wish we could sing as good as you"That was me cured, oh I still get tinges of the old inferiority but console myself that at least I try, so you carry on ok