I live my life not having regret, what about you?
I do not have a negative conscious.
That's great! Life is a lot less stressful that way.
In some societies adults have the highest regrets regarding choices of their education. That is crazy to me.
I could see people having regret about that but it's in the past and you can only look forward with a positive attitude.
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 "
Instruments to measure regret in people having to make medical decisions have failed to address current concepts of regret and failed to differentiate regret from disappointment. They have also not looked for positive impacts of regret. Process regret may occur, if a person does not consider information about all available choices before making a decision.
Life domains.
A 2005 meta-analysis of 9 studies (7 US, one Germany, one Finland) about what adults regret most concluded, that overall adults regret choices regarding their education the most