Loneliness!

[InbetweenDreams]

Points 2 & 3 are things that you should work on because if you can't have friends over and you can't go out, that makes it limited on what you can do with your spare time. There's places like this, you can use things like FaceTime or Skype to talk to friends or family. Read books, do something creative like art, play games, exercise if you're able. Basically you're filling your time with activities of some sort, it is best to not be idle.

At any rate you have to have connections with other people, even if it's just going to the grocery store. While that doesn't mean you have to go out to have those connections but it does put a monkey wrench into doing those things.