I believe there is nobody who has never regretted in his or her life. Something happened or didn’t happen the way you would have expected or you said or didn’t say something the way you would have wanted. Now you are wishing more than ever if you could rewind time and do it all over again.
Replaying and rewinding all the scenarios doesn’t help but enslave you to your past. It is very unfair to use the knowledge you have gotten now to punish yourself on information you didn’t have then. Taking proactive measures is vital in enabling you to move on. Concentrate on the lessons you have learnt to make better and informed choices moving forward. Never dwell in the past.