It's not cool to worry. Cool people do not worry, they are impervious and resistant to and above the slough of worry. They float above the clouds of worry or sometimes just for the hell of it they dive down into those same dirty clouds and inhale and on the other side emerge with no worry. No worry, injury or consequences; for the ordinary and mortal there are consequences, for the cool there is only continuous progress and the shining light of being right.
Worry is unbelief, lack of trust, confidence and conviction and in general terms thinking and believing in the worst. Of course the worst hardly ever happens, it's an illusion, a beast, like the Devil or the Bogeyman or visiting some sterile industrial wilderness. The conclusion? We can be cool, we can not worry by choice, we can breathe in the cloud in great hearty lungfuls. Then one fine day we might all fly again - by Zeppelin of course.