Don't you every start wondering, what if I could take back my mistakes made in life? The smallest detail could mean the biggest thing if you allow it to unfold
Regret
Regret is a negative conscious and emotional reaction to an undesirable situation. 
Regret is related to perceived opportunity. Its intensity varies over time after the decision, in regard to action versus inaction, and in regard to self-control at a particular age. The self-recrimination which comes with regret is thought to spur corrective action and adaptation. 
In Western societies adults have the highest regrets regarding choices of their education. 
Definition.
Regret has been defined by psychologists in the late 1990s as a "
Columbo revealed: "All my life I kept running into smart people. I don't just mean smart like you and the people in this house. You know what I mean ..." He added, "I could tell right away that it wasn't gonna be easy making detective as long as they were around", but he determined that he could even the odds "by working harder than any of them, reading all of the required books and paying attention to every detail."
His trademark outfit