A lack of confidence is not a dealbreaker. Nor is being shy.
What is the dealbreaker is self-pity and a piss poor attitude.
Everyone can have a bad day, but the ones that dwell on that shit and regurgitate it over and over...
It gets REAL old fast.
I personally prefer the shy, quiet and thoughtful type.
These are the guys that speak when they have something to say and not because they have to say something to break the silence.