Self-awareness is a very good thing. At Fylde Festival they famously hosted a Worst Singer in the World Context which had no shortage of takers, each fully aware of how bad they were. It's those who are bad and don't realise it that bother me - I've known a goodly (or badly) few truly excerable singers down the years who thought themselves worthy of attention; just as, conversely, I've know some really amazing singers who had no confidence in their abilities whatsoever and gave up - in one case because of criticism from someone who couldn't hold a tune in a bucket. Go figure.