love your signature by the way had to say that...

anyway, it does sound like your anxiety was very high at the moment. I get nervous in front of ppl too. Try some breathing before. When you start to tense up, breathe. Try some muscel tension/relaxation- make a fist. tighten it. then slowly release the tension so that your hand relaxes. You can even match it with your breathing if you want- breathe in while its a fist, then slowly breathe out while you release. Best of luck!