How to stope beating myself up for costly mistakes?

I got a $75 parking ticket today. Not the end of the world, and I know it happens. But I will obsess over this and beat myself up for it for weeks if not months. I feel so stupid. This is just a small example. Usually mistakes of decades ago, or missed opportunities, or decisions which in hindsight were poor, haunt me. I’m middle aged now and I anticipate this feeling persisting through the rest of my life. How can I let this go?