Be confident for what you think, do and express.Be Confident in what you know and what they do not know.

I had met a Lawyer in London who don't even know how to start computer and he is confident of that he don't know. He was not ashamed as well because he know he is best in his field and he says that confidently.

A fat computer programmer should be happy and confident saying that I can make software better but should not be ashamed for saying I can not run fast.

I am writing this wishing every will try be confident. Lastly what I want to say is if you are not confident means you lack of KNOWLEDGE. So, get more and more knowlege and BE CONFIDENT.