Understand that the time in the audition is your time. Really own it and take control of it. And do what you prepared. Focus on really executing what it is that you intended to do.
All you have is yourself and what you have to present, and just focus on that. And if you can walk out of the audition and say to yourself, 'I hit all my beats,' 'I accomplished my emotional honesty,' or 'I remembered my words,' then that's winning.