I flew long haul, at least once a month for thirty some years.
I was scared every time.
Apart from nightmares, I have been more frightened on aircraft, including 747s , than at any time in my life, even when being attacked.
Why?
Well, it had nothing to do with aircraft, or science, engineering , claustrophobia or understanding. It had to do with falling. Old, old genes maybe, from the days back in Africa, up a tree somewhere.
I hid it pretty well, except from people who knew me very well. I never panicked, never refused to get on a plane. Helicopters for some reason, I didn't mind. I have bungy jumped, looped the loop in a Tiger Moth
and flown in a Microlight, but turbulence in a jet or fast fixed wing just terrified me.
Once, I had to fly as the solo passenger in a Pilatus P6 into the Algerian Sahara. In summer, the thermals are never fun. The pilot (East German Air Force trained), knowing I hated flying and deciding to shake me up a bit, stood the plane on one wingtip at take off and pulled a couple of gees. In the climb, I informed him that if I threw up, I was going to do so over him. The rest of the flight was smooth as silk.
Be tolerant of the fears of others. They may throw up on you next time.