What is the point of abusing yourself with guilt in the first place? If you did make a mistake and act in a hurtful way, your guilt won't reverse your blunder in some magical manner. It won't speed your learning processes so as to reduce the chance you'll make the same mistake in the future. Other people won't love and respect you more because you are feeling guilty and putting yourself down in this manner. Nor will your guilt lead to productive living. So what's the point?