Definitely second petewarden's suggestions 'exercise' and 'get a hobby'. You do not have to join a gym or anything. Exercise can be something as simple as going walking for an hour with your iPod (or equivalent). No matter what the particular exercise, the fact is that it will usually get you out of your own head for awhile.
Aside from those I would suggest maybe reading Party of One [1] and/or Quiet [2], as they bring to light very well the fact that mainstream society unfairly and illogically looks down upon those who prefer aloneness. Being surrounded by laughing groups of sociable people has a way of making anyone not involved feel like they are missing out on something or that there is something wrong with them, when this might not be the case at all.
Props for such an honest post; and I hope you feel better soon.
Aside from those I would suggest maybe reading Party of One [1] and/or Quiet [2], as they bring to light very well the fact that mainstream society unfairly and illogically looks down upon those who prefer aloneness. Being surrounded by laughing groups of sociable people has a way of making anyone not involved feel like they are missing out on something or that there is something wrong with them, when this might not be the case at all.
Props for such an honest post; and I hope you feel better soon.
[1] http://www.amazon.com/Party-One-The-Loners-Manifesto/dp/1569...
[2] http://www.amazon.com/Quiet-Power-Introverts-World-Talking/d...