I have seen people living life with plans at a small and finite granularity. I have also seen people living life moment to moment.
In the former case, when a plan misfires, misery kicks in. While in a later scene we accept things as it happens.
I am not saying we should have a life with defined or un-defined plans. All I am saying is that we can only do things with the certainty of giving the best foot forward from our side. But expecting a desired or planned outcome from it is not wise.