Ever since I was about 5 years old, I believed I was the last living human in the world - everyone around me appears as human, but they are really aliens from another planet. The only reason they keep me around is to study me. Once they fully understood me (ie what it means to be human) they will have no further use for me and will kill me.
Around the time I was 25 years old, I started to crack a few holes in this belief, but there is still some residue of it remaining. This belief caused me to perform very bizarre behaviors when I was younger - the reason being that I had to be very unpredictable so as to prevent the aliens from fully understanding me, and thus, my life would be prolonged.
Does anyone else experience anything like this? I have read about the Truman Syndrome, but my beliefs are different. There were no reality shows to identify with when I grew up in the 60's. Also, it would be kind-of nice to only think that people are watching me, not that they are watching with the eventual intend to kill me.