I once had a very weird experience on LSD (of course), in which I perceived my brain and thinking as a bunch of separate entities working in synchrony. Only two of them were capable of speech, and some were very simple and reactive. The "me" part was just them agreeing on stuff. I will never forget the experience.

  > I often think that maybe I'm just crazy.

Everyone is crazy, just most people are afraid to admit it to others. A lot of people are even afraid to admit it to themselves. Some people pretend so long they forget they're pretending. But wouldn't that itself be crazy?