How does Gregor feel about the people he meets in his workplace?

Gregor feels as if he never gets to know any of the people meets or become friends with them.

Oh, God", he thought, "what a strenuous career it is that I've chosen! Travelling day in and day out. Doing business like this takes much more effort than doing your own business at home, and on top of that there's the curse of travelling, worries about making train connections, bad and irregular food, contact with different people all the time so that you can never get to know anyone or become friendly with them.