Insecure Writers, Christmas Edition

I hope we all know the routine by now. Alex J Cavanaugh started the Insecure Writers Support group a few months ago as a chance for all of us to vent our fears/frustrations about writing and to encourage one another. So, please go sign up, or, if you're one of those writers that doesn't struggle with confidence, then go and encourage all your fledgling brethren.
Last month, Nancy, who is a mental health expert in the real world, mentioned that the imposter syndrome plagues many people. But...