You can bet your bottom dollar that when you're feeling defeated by something... there's a little voice inside your head comparing you to someone else, real or imagined. Someone who appears to be doing it a whole lot easier and more impressively than you.
A voice that robs you of all self worth saying, ever so quietly... 'you're not good enough' or 'who are you to be writing/making/talking about....'
And to that voice I'm slowly learning to say 'Damn you. I'll give it a shot'. Slowly I'm starting to catch myself.