You don't say whether those nerves are before the flight or during the flight?
I used to race cars many moons ago and before the lights changed sitting in the grid the nerves were high! As soon as the lights changed the nerves went!
Nerves in flight ? Use positive thought as its negative thoughts which cause anxiety and these will usually be worse when you have time to think rather than when you are busy flying an approach or departure with no room in your mind to think ))
But as others have said a certain level of nerves are normal and will make you perform better! But if they are continuous and to the point that you don't enjoy your flying then you need to learn how to control those nerves and not let them control you ))
Pace