You're definitely NOT a lemon, Matt.
And I also understand every word and every feeling you expressed regarding that broken feeling. Just keep it in your mind that those thoughts were given to you and shaped your perception of yourself as a young child. You can thank neglect and abuse for that.
It's a pattern of self thought that is broken - the THINKING is broken, but YOU are not. Our task is to change how we think about ourselves (and rid ourselves the shackles of feeling like a lemon).
It's a heroes journey, and you are the hero.
Loving Kindness Meditation will dramatically improve your spirits; give it a try for just 3 days: http://www.youtube.com/watch?v=sz7cpV7ERsM