The most destructive thing about guilt is not the fact of the mistake itself, but the habit of making it a permanent diagnosis. We often confuse constructive work on mistakes with an endless emotional lynching, in which we ourselves act as accusers and executioners.
But the admission of responsibility has its logical end. A mistake is a road sign, not a lifelong stigma. The lesson is learned, conclusions, and the energy is directed to the present, and not to the endless repetition of the film.
Maturity lies not in never making mistakes, but in the ability to close gestalts with oneself in time. Fixing, letting go and allowing yourself to move on without the baggage of old grievances against yourself is the highest form of self-care. Life is too short to waste it trying to prove to yourself that you have a right to exist only by atonement for days gone by.