As in ehn... The amount of time people spend brooding and worrying over past deeds ehn, when we know very well that it won't solve anything. I stopped it a long time ago. I don't even like it when people keep talking about past mistakes, because it keeps you back even though you don't notice it. Nice of you to learn it at a young age.
It is actually very stressful to be dwelling on past mistakes for too long. But I guess some people just find it rather convenient. Good we're on the same page, man.