One screw up = I'm ruined. At least I act that way some of the time.
I can relate to you so much regarding this mentality. Or at least this statement.
If I make one screw up, it's going to stay with me in my memories forever, and the agonizing pain with it can always be felt even if the wounds have healed. A few years ago, I always cried or tear up, but now I just feel blank, like there's no life within me. Sometimes it gets worse than that as I can get very very moody and even passive aggressive. It's a complication that I wish would just go away. I keep my feelings to myself when off a computer, and I am not one to show much emotion in public. It's just how I am, but because of that, no one really understands how I feel. Some say that I am one very misunderstood guy, but I am to be blamed for that.
Honestly, with that said, I hope the best for you. You are not alone, as I am in a similar boat.
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Also Eddy, I hope you enjoy tomorrow.