When you do something with only half your heart, it doesn't matter too much if you fail at it. But when you put your back into it, and work as hard as you possibly can, there can be no room for mistakes. At least, that's how you feel. Making a mistake is the hardest thing to live with. It's humbling because it reminds you that you're not perfect and certainly not invincible. But it's also humiliating, because your weaknesses are evident to all for the length of time that everyone takes notes of your shortcomings.

The healthiest thing is to accept it, look at what you can learn from it, and move on. Hopefully, you will get a second chance to prove that you've learned from it.