"An essential aspect of creativity is not being afraid to fail."--Edwin Land

Fear--and laziness--are the two things that get in the way of our progress.
Fear is the big one, and we minimize the fact of our fearfulness with excuses like "too lazy", "too busy" or "too tired".
If those excuses are not enough to staunch our fear, we start to minimize ourselves with songs of self-loathing like "not good enough" or "not smart enough" or "just not creative".
We'll tell ourselves anything so as to not feel the fear.
And how can we avoid feeling afraid?  Our culture teaches us that life is hard and dangerous and fear is the smart response to it--but we know deep in our hearts there's a lie embedded in that construct so we're, rightly, ashamed of our fear.
How can we get over being afraid?
The only way to show ourselves that there truly is nothing to be afraid of is to do that thing you're afraid to do--within reason.  No diving off cliffs or getting involved in chicken races, mind you, but challenges at work, in relationships, or in creative ventures are life-or-death only in terms of the ego.
You'll know if you're being run by your ego.  You'll feel afraid.
How can you free yourself from your fearful ego?  Be creative, in thought, word, and deed.