Even the most gutsy, confident and optimistic among us suffer from crippling self-doubt at times. It's inevitable to the human condition.
"Self belief is having good hair," so says immaculately turned out Cat Deeley. Similarly a great outfit can give you bags of self-esteem according to Giorgio Armani.
And if you ask George Clooney, the way to feel truly confident is to fake it.
From not comparing yourself to others to having life experience and embracing your self doubt and fear, if you're having a crisis of self doubt we are here to help. We've gathered the top tips, quotes and motivational advice from authors, actresses, singers and other high-profile celebs to help you climb back on to that high self-esteem horse.
We may see these personalities as being at the very top of their game, but many of them mention self-belief and confidence being a tough process involving a lot of self-doubt that they have to work at eradicating.
Enjoy their words of wisdom and hold those heads up high...