Back Door Braggart
n. A person who states a problem that they have with the express intention of letting everyone know how awesome they think they are.
Sarah: Lets go check out the new mall!
Lisa: Oh I hate clothes shopping anymore. Since I've been working out I can never find anything that fits because my waist is too tiny and my tits are too big. Life is so unfair!
Sarah: You're such a back door braggart, Lisa. Go screw yourself.