It's a self esteem thing, I know a couple of people who think they are Gods gift to song writing, they have bags of confidence and self esteem, they are crap but seem totally impervious to any criticism, I have also witnessed a big name being sick in the toilet and muttering "I have to follow them", "them" were a local support act, this person, of course, was superb. So, place yourself in there somewhere between Rhino hide and tissue paper and go for it. Do it, do it.