Thought this was rare but after much observation I realized many people have this problem. What's with them, why do they seem to portray this lack of confidence? Here's my own explanation.
When you are walking down a street, you would have this thought that everyone or at least a handful of people are looking at you. Being human, we are very much self conscious and these people with rather low self esteem seem to react uncomfortably to it. This applies too when talking face to face with a person whom you are not very close with. Am I right? Here's my suggestion.
Why not try for once to look at a person in the eyes, start with someone whom are comfortable with and maybe it will help.

When I read this, I thought of my boyfriend. Some months ago, I couldn't look into his eyes at all when I met him and all, I knew that I was going to leave him first. Then really I left him, that confidence thing. Now we are back together and I can look into his eyes and speak to him and he too... So I know that I love him very much and he loves me too long before which I could not see (in his eyes)
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"The best color in the whole world, is the one that looks good, on you!"
Coco Chanel