Would you mind answering my question please?
When my phone rang .I thought it's my teacher.I became nervous and my whole body became deadened.
Could you please correct this statement?

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Your question was, "could you correct this statement?"
The answer is either Yes or No!
Try to formulate in a better way.

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Stephanie's idea of 'froze' is nice.

Another word you could use instead of 'deadened' is 'numb'.

...my whole body went numb.'

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When my phone rang .I thought it's my teacher.I became nervous and my whole body became deadened.

"When the phone rang, I thought it was my teacher.  I became nervous and froze."

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When my phone rang, I thought it was my teacher and I became nervous and my whole body was shaking with cold.