Funkydorae's thread on existential loneliness made me want to Google it.
I found this quiz in the process...OkCupid | Take The Existential Loneliness Test
You scored 29 Socially Involved, 39 Alienated, 36 Contented and 51 Optimistic
While you are not heavily alienated to others, you are very discontented with your social situation. However, you appear somewhat optimistic, so while you don't appear to interact with others often or meaningfully, you beleive this will change. My guess is that you suffer from circumstances more so than elements of your nature and that you believe the adversity of the circumstances will eventually go away or be overcome.