imposter syndrome

One of the greatest author and poet of our time, Maya Angelou wrote eleven acclaimed books in her lifetime. Yet, she once admitted 'I have written eleven books, but each time I think, "Uh oh, they're going to find out now. I've run a game on everybody, and they're going to find me out.'
One of the reasons I lack confidence in many situations is feeling like an imposter. Like I'm a total fake: just waiting to be found out. Whether it was when I was in my first job (junior web designer), with no real experience in web design other than my own experiments in Dreamweaver (more like Nightmare weaver...)
It helps to remind yourself every so often about your good qualities. Think about all your achievements. Write them down in a list. Look at the list frequently. We all have our strengths and weaknesses. Focus on your strengths.
If I have someone there beside me then it's better, they act as my safety net in case I say something stupid, or lose track of where I'm going, but if I have to do it on my own things get pretty unpleasant pretty quickly.
I stand on stage as many as 80 times a year with audiences as big as a 1,000 and as small as half a dozen. The great and the good, the serious and the less so listening intently often making copious notes, the subject could be anything from Corporate Governance to Corporate Finance or even an insight into my so called success...