I am not a psychologist.
I'm guessing you don't have a fear of flying. My completely uneducated (in this area) SWAG is that you're a perfectionist and have very high standards for yourself, and that your fear is less to do with flying itself, but making some sort of mistake that will have tragic repercussions on the airframes that you (or downstream entities) are manufacturing and putting into service. How has work been? Stressful lately?
How did I do? Do I win a cookie?