Does this sound like you?
"I can't do this. I'm not...
Smart enough (don't have that degree)
Tall enough (no one will notice me, I'm so short)
Pretty enough (all the pretty girls get all the attention)
Savvy enough (whatever that means)
Thin enough (no one will work with a fat girl)
Confident enough (my stuff is okay, but so is hers, and hers, and hers)
Young enough (really? you're still saying that?)
And the list goes on and on.