I've had a strong dislike of turbulence since I started flying over 40 years ago, at first because I didn't understand it and now because I do. It takes some time to get over a complete fear of it, but here are a few tricks I've adopted over the years:

1. First and foremost, just keep reminding yourself: the pilots don't want to die, either! They know what the airplane's specified limits are, and they know the specified limits are much lower than the design limits. They will not knowingly fly into any area of severe or worse turbulence, and most will do their best to avoid even moderate turbulence.

2. Become familiar with the definitions of the various levels of turbulence. When your drink starts sliding across your tray table, or the captain has the flight attendants take their seats, you might be in moderate turbulence.

3. Open your air vent so you have at least a trickle of fresh (more or less) air blowing on you. This works wonders as a calming agent.

4. If you're flying on United, and the captain has made Channel 9 available, listen to it. Specifically, listen to the turbulence reports made by the various aircraft. I find it helps a lot to (a) know that it's not nearly as bad as it feels, and (b) what's coming up. In fact, I can tolerate a lot if I know it's coming -- roller coasters excluded!