It's so not easy being human, and I think it all comes down to the absolutely exquisite pain of knowing time is passing. It's that knowledge that trips us up, makes us desperate, makes us hasty. And, of course, nothing good comes from desperate hastiness.
But the beauty of being human is that we *can* learn from those mistakes; we *can* alter our reactions in the future. Sure. We CAN, but do we? It usually takes a few turns around the sun (more time passing...) before we assimilate those lessons. That's the steel-toed irony, isn't it? If we could stay in the moment, we'd no longer fret so much about all this time passing and, of course, we'd make fewer so-called mistakes.
So, I don't know. It's hard--all of it. But it's lovely, too, when you can BE in that moment. When, occasionally (until it's more than occasionally), you can call yourself back to center, back to the moment. And when you drift, when you flap, forgive yourself, and just come home.