While it may have come easier when they were younger, some people have a hard time making friends as adults. Perhaps they're incredibly shy, suffer from low self-esteem, or even prefer to be alone.

The One Where An Actress Was Almost Replaced. Stream NBC 5 for free, 24/7, wherever you are. "Schwimmer had no one to bounce off," Burrows wrote in his memoir "Directed By James Burrows," per People. ...