Embrace the adrenaline and treat it as a positive.
Fortunately, there is evidence that some level of stress is actually helpful, and can improve performance—provided you believe that this is the case.
Elite athletes, for example, often believe that adrenaline, one of the main stress hormones, is helpful in improving performance. It is, after all, the ‘flight or fight’ hormone, so you can harness it to help you to ‘fight’.