You just reminded me of a girlfriend I had in NYC when I lived in NJ. I remember the first time she came to see me. She had never left the city by ground transportation & didn't know how to use NJ Transit lines.
This isn't unusual and is part of the appeal of living in a big, self-contained city. When I've lived in NYC I rarely had much need or desire to go anywhere else and if I did it was something vastly different and via plane.