Yes, it is true that there are some mistakes in life which can never be corrected. I am going to give you one example by which you will understand better!
Suppose you had done love with a girl or boy in the past and after that you had cheated that girl or boy and had done break-up. Then in this case you can never correct your mistakes.
But what you can do is, you should ignore your past mistakes of life and try to learn from those mistakes. Try to never repeat those mistakes again in life.
Don’t feel guilty about the mistakes you did in past. Instead keep in mind that, in life no person exist who had never done mistakes in their past. Human being is a mannequin of mistakes.
But big lesson is try not to repeat those mistakes again in life and do good deeds so that you can live a happy life.
Yes it is true that some mistakes can never be corrected in your life, for example when we cheat our loved one and do break-up. But you should ignore your past mistakes and try to learn from those mistakes. Try to never repeat those mistakes again in life.