No I appreciate feedback, I will even accept positive criticism that I can learn and develop from, but theres 2 or 3 jumped up people who just think the best course of action is belittle inexperienced referees that genuinely seek help and guidance.
Padfoot gets off on that. You'll learn to ignore or block him.
Nobody else has said anything that could possibly constitute belittling....
Personally I would have said that while harsh, a red can still be justified here - I wouldn't recommend requesting the red be overturned unless you know it's completely, utterly, with no argument or doubt, wrong.
Now it's happened, see if you can work out why you gave the wrong decision. Did you respond emotionally? Were you already starting to lose your cool?
Also, you said you were dwelling on it - dwelling on your mistakes during the game will hurt you. You'll lose focus and the game will snowball. And I promise, you'll make far worse decisions than this
Working out how to move on from the mistakes is a challenge. I learned to , like Happy Gilmore, go to my happy place. A few moments of envisioning myself somewhere calm or in a good headspace (eg the emotional space of getting pumped and ready to go out to a party or something). Take yourself there for a few moments, you might be able to let go of the mistakes.
You'll also need to work out how to not dwell on incidents. Reflect upon them, think about what you could have done, even ask for help, but more on. Don't let yourself ruminate over an event - whether it's a mistake, a frustrating player, a bit of abuse, whatever. Otherwise it eats at you and you ruin your weekend. As I'm sure you've found out