Although high school yearbooks have categories for 'Most Likely to Succeed' and 'Class Clown,' there is no superlative for 'Most Shy.' The teenage years can be a difficult transition period, especially if you're not an outgoing person. If your teen is shy, I've got some tips to help them break out of their comfort zone.
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My daughter is 15, and, like most teens is concerned with the social aspect of high school... She is shy and feeling overwhelmed with not being outgoing enough. 
We tend to think only introverts are shy, but that's not true. Shyness has more than just to do with being uncomfortable around other people - it largely comes from being worried about rejection.