I don't really have an answer to a question that is so subjective. I am sure of myself. I know I won't do anything that I won't approve of otherwise.
I'm a generally confident person. There's really all there is to it. I'm open to being told I'm wrong. I am open to debates, I just know where to stop. I guess I'm generally okay.
I've stood my ground, I've said I've had enough and I've walked away from situations immaterial of how happy or hurt I would be and that takes a little bit of courage. I guess that's a little bit of confidence or something they say. I've been strong for myself and for all purposes keep my (in)sanity intact.