How do you get out of nervousness?

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It is really a pain in the neck. I've found myself stranded in a high level of tension every time there is an opportunity to show my talent. I can't stop being nervous. It expands in my heart as the moment approaching. I don't know how to shun it. It feels like out of control. The more you tell yourself to be calm, the faster your heart beats. I take a deep breath,practise smiling,tell myself i'm the best of all, and even sneer at those competitors inwardly. That does no good, not effecitive at all. My mind is in a tangle when it's my moment to shine.So what the hell am I doing? I'm doing nothing but let go of every chance of making a difference. Are you easy to become nervous? What do you think is the best way to overcome,or at least reduce,this sort of negative feeling?