How can I shake off the first volleyball game jitters?

Tomorrow, I have my first volleyball scrimmage and i am very nervous. Im on a 7th and 8th Grade team, and I just learned and still learning the game. My coach has a tendance of getting upset when someone doesn't get to the ball fast enough and im afraid she'll get really mad if i get confused, so I am trying to find a way to knock out those jitters.