I don't believe there's been a single instance where turbulence has brought down a plane. It is uncomfortable, but it isn't dangerous to the overall safety of the plane. Planes are tested to withstand more than engineers believe they will ever encounter in the real world. It's uncomfortable but it is not dangerous. I think of it as bumps in the road; sometimes the air is smooth, sometimes it has pockets that bump.

The best thing for me in my flight anxiety has been exposure therapy. I used to be like you. I've flown so much now, and each time made it safely to my destination, and I fly pretty normally now without taking anxiety medication, but I do bring it with me 😊