*Hugs* Your problem is hardly a petty. It hurts to give of yourself, expect all the world to see in your work what you do, and then suffer rejection. I wish I could say that such things stop hurting. However, they can be used to grow as @Jaywalk said. There is nothing wrong with you! It is natural to question and doubt, but know that the fact that you were not chosen does not speak to your abilities. Be strong and remember that you are amazing and the world would be a poorer place without you!