If you think everyone is judging you, that if you miss you will let your country down, you will create a pretty negative experience in your mind.

Why not re-frame it and think that you are about to do what most people could only dream of doing?

That you have the power to make people happy and are going to enjoy the moment no matter what.

If you think in these terms, how different is the experience, and the state you access, going to be?