If you think that's normal you have never read the breed standard!
CKC breed standard:
The Shepherd Dog must not be timid, shrinking behind its master or
handler, nervous, looking about or upward with anxious expression or
showing nervous reactions to strange sounds or sights, or lackadaisical,
sluggish, or manifestly disinterested in what goes on about him. Lack of
confidence under any surroundings is not typical of good character.
Cases of extreme timidity and nervous unbalance sometimes give
the dog an apparent, but totally unreal, courage and it becomes a
“fear biter,” snapping not for any justifiable reason but because it
is apprehensive of the approach of a stranger. This is a serious fault
subject to heavy penalty.
No, it's not normal and unfortunately, it is likely genetic. When did these fears first develop? Please tell us a bit more about his history.
I had a Shiloh shepherd who was fine as a pup, but went into a 'fear period' at about 8 months, and never came out of it. Suddenly she was scared of children, small dogs, men, bicycles...the list goes on. I worked with her for a year and a half and there was very little improvement. It took 3 weeks in an obedience class before she'd even take a treat from me, and nearly the full 8 weeks before she took one from the instructor. Her preferred spot in the class was hiding underneath my chair.
I assisted at her whelping, and took her home with me at 8 weeks, so there were never any things in her life that might have caused these fears. Other Shiloh owners also reported problems with timidity in their dogs. Some even had trouble getting them to leave the house to go on walks!