You let the tank die.
You missed the interrupt.
You didn’t line up your cooldowns properly.
You died to the fire.
You dispelled the frost bomb in the wrong place.
You got hit by the ball.
You hit a healing cooldown on a purple ooze.
You faced the boss and it cleared the whole raid.
You didn’t hit the Heroic Will button.
You want to quit the raid in shame and disgust at yourself for failing so hard.
No way. No how. Not a chance.
You learned something that cost the guild bank hundreds, possibly thousands of gold.
Make that gold count.
Look, I get it. You screwed up.
You can punish yourself, if you want to.
You can deposit money in the guild bank, if you’ll feel better.
You can apologize profusely to the raid, if you think it will help.
Everyone deals with personal failure in their own way.
At the end of the day, it doesn’t matter what you do as long as you learn from it.