Two words is all it takes, if you could just take it to heart. Two words could change the course of your world, if you allow it.
But Bob Newhart explains the process better, so I'll let him take over from here.
Now this is tongue and cheek, but imagine if you made a conscious decision to just 'stop it', without bringing up your childhood, or dreams you've had, or other excuses?
So let's try it some time. Next time you start to feel that fear or hesitation...STOP IT, and see what happens.