Have you made any mistakes in life? Say no and I will call you a LIAR. Hahaha!
Every decision brings about a consequence in life. Bad decisions lead to bad consequences while good ones lead to bliss. But in order to have decisions, there will be options to choose.
I remember making a bad decision many years ago and almost making it again a few years ago. The thing is, it dosen't matter that much if you have made a mistake, what matters more is the consequence of it. Some lasts only for a moment, while some for a lifetime.
You need courage, boldness and strength to face them. It is not easy all the time but you know you have to. You won't want to sweep it under the carpet and have it springing out at you one day when the carpet cannot hide anymore rubbish under.
I think beyond that, maturity and a sense of responsibility are elements which convicts us to face our mistakes.