I'm afraid something I've written isn't good enough, or that no one will relate. This happens mostly when I'm attempting to write a contest piece with a prompt. I think my story is great, but if I read other entries that are better I don't post mine, especially if one member in particular has responded because, almost always, they win.
Congrats to that person.
Note to self: don't read prior entries. A win is wonderful, but simply writing something is the true success.
Note to any judges: I've judged contests before and it's not an easy task. Every judge has my respect, and I never question their choice.