A good way to build confidence?

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I am just looking for ways to build my confidence because I tend to think of myself negatively like how I look, act, speak...... I am a student at a pretty selective college, and I feel that everyone around me is better. That kind of keeps me to be more reserved around people. I don't think my condition qualify as clinical depression because how I think of myself doesn't interfere with school work or have serious impact on my life. Still I feel that if there is a way to break this "habit", then I certainly would try to change myself because I am not so enthused with the way I am. Help?