WHAT COULD I HAVE DONE BETTER?

 Wherever we are we have to slog it out.

There is no escape from that.

We would have failed at times. 

We might have succeeded too.

To do well in life we are thus forced to redefine ourselves for our tomorrows.

 For that, as the day ends ask yourself what could I have done better?

You'd find the exercise transforms you beyond imagination.