Worms on the brain? One must first have a brain to have worms on it...and clearly I don't have a brain. (I think there's a peanut in my head though...or cats.)
I don't believe people who say they have no regrets although like to hear that people have made peace with them and not allowed those things to damage their onward journey too much or at all. It's not easy of course, but it's worth the effort.
There are a couple of foul ups that haunt me in my quiet moments on occasion still, but a good stiff drink and some good conversation or music will help gte my mind moved somewhere else rather quickly.
I'm the same, it happens. I mean, we do things for whatever reason, orders for instance, and maybe don't think about the ramifications on ourselves or others and later in life they bubble up, or blow the fuck up like a volcano...we just have to manage, that's all there is to it. Find ways to manage.