1) Pride. (The worst of the lot of my bad character traits).
2) Stubborness/Pigheaded/Willful (Adjectives of that nature)
3) Distrustful.
I know what you mean by the perfection on this site, intimidating isn't it? So I'll add a few more...
Also, drink far too much red wine, I smoke, I can be moody, I'm lazy, I lack ambition, I'm easily distracted, I rarely loose my temper but by God when I do you'd better stand back, I've got an acidic tongue when I want to, I'm cocky, I can be rude, I'm judgemental,...
Is that enough for you tiny... I'm starting to wonder why I even have friends! ;0)