A childhood belief about i'm different

We used to move around a lot when I was little, but whenever we moved somewhere new, I used to think that everybody we knew put on different clothes and make-up and followed us to our new place and pretended to be different people. Sort of like some very odd and twisted version of The Truman Show. I always used to really stare at people who looked vaguely familiar or similar to someone I knew, just to try and catch people out...