I should have done “that”

Whenever I sit down and sum up my whole life till now
Among so many things around me, all I can recall anyhow,
are my mistakes. The small ones, the big ones.
Don’t even ask the numbers, they are more than tons.
But when I contemplate over them one by one,
I realize, one of those mistakes was a well-thought decision.
The only difference is that I have evolved with time,
and now, that mistake looks like a crime
For every passing second, I keep saying
“I should have done that” where I suppose
“that” was far better than what I actually did
What really scares me, is my present,
I am doing things, over which I will lament
after overthinking them as mistakes in the coming future
Can’t promise but I will try not to do that.
But again I think I should have not regretted
Sorry, can’t help!