If you won’t remember this specific event in a week (let alone in a year or at the end of your life), then stop worrying so much about it. It’s not a big deal. Don’t blow things out of proportion.
So what if you got a B (or C, D, or F) on an assignment? Does that mean that you’ll never succeed in life?
So what that you didn’t get 8 hours of sleep? Does that mean you’re going to be a zombie the next day?
So what if your kids have some chocolate or didn’t eat the most perfectly grown, organic/non-GMO food today? Does that mean that they won’t grow and their health is now in jeopardy?
The point is, we are more resilient than most people think and so are our kids (if we let them). Don’t think that everything has to be perfect, because it won’t be – and you’ll drive yourself crazy trying to make it perfect. Go with the flow. Be nice. Treat others well. Do your best everyday. But be kind to yourself. Understand that the goal should be progress, not perfection.