You will get over being nervous in turbulence. In fact, given time you will begin to enjoy it because it adds a new and different challenge to flying. Can you hold your altitude or heading dead on during turbulence? Or can you shoot your instrument approach like Chuck Yeager during turbulence?

Keep going up, but take small steps. Don't try and jump into turbulence that a jet is reporting as moderate. Your instructor will be aware of when is for sure 100% to bumpy to fly. If you find you are having a hard time with bumps after a few lessons try to fly early in the morning and slowly work your way up to the afternoon bumps.