Dear Dawn, you have an OSCE in about an hour and a half, relax, breathe. Being a body for the first two people is not that bad. Sure you will be partly naked, praying not to be exposed. Sure frictions and fascia work are pain provoking. Sure you didn't practise nearly enough.
Breathe! (an then bull shit when its your turn)
Look on the bright side, when they finish its your turn to work on them.