Per the Nike Ad do YOU JUST DO IT or do you have to arrange for it plan for it make room for it? Why?

Sometimes the longer I think about the doing and make plans for it the less apt I am to actually do it. Are you like that too? I wonder what causes that? Fear of failure? Apprehension that we will disappoint or be disappointed so it's better not to bother? I dunno. T'is a puzzlement!