I just realized recently that it was not just me, even non-JW adults have a difficult time making new friends, and so forth. For instance, those who have to move to a new city for work might have a difficult time.
This episode of This American Life had a segment about that:
http://m.thisamericanlife.org/radio-archives/episode/587/the-perils-of-intimacy?act=2#act-2
It helped me realize that I am not alone with this problem.