Acually, man, I've been OFF of amphetamines for a little over 5 years. I actually always thought about the concept of everything being fake and me being inside a virtual video game of sorts, and no one was real and nothing was of considerable consequence. Then I got hooked hardcore on dextroamphetamine and methamphetamine at the same time and it became the only thing that made any sense to me at all.
Ever since I quit, this part of my thought process has stuck. No matter how much I try to convince myself that I'm wrong and it's just crazy to think that way, it permeates my every thought, whenever a decision regarding my moral compass comes into play. I still think that I'm crazy, that it's just me being off, but you know what? It's normal to me. I think like this all the time. It takes other people making comments and observations regarding my behavior for me to sit back and think: "maybe I really do think differently than everyone else". And I don't use the term 'crazy' lightly; in fact, I hate using it...but I am just, realistically speaking, probably way more throwed off than 99% of the world's population. I'm very lucky to still have a grasp on "reality".