Yup - don't worry about it!!! The slight turbulence which you probably never (or very rarely in commercial airliners) experienced before, will soon become second nature. Habituation is a bliss thing!
Turning, climbing, descending and understanding how planes work generally help the mental blocks, but after a few hours of flight, you shouldn't be as scared, and those bumps will most likely become barely noticeable (unless you get a thermal-y day!)
Good luck with your training!