I have had this issue circulating in mind probably since I was in kindergarten. The basic question is this: how – being conscious of my own being, seeing through my own eyes, thinking my own thoughts, interpreting all the other senses, etc. – can I know or accept that every other person in existence does the same thing, if I myself have no way of experiencing other people's beings except from a third-person perspective? From my vantage point, I am the only person who has his own thoughts and autonomy. It has often occurred to me as an afterthought that, since I consider myself pretty intelligent in my own right, that perhaps everything else in my environment could be some massive illusion that my own mind is causing me to accept as reality. Could the fact that there are philosophers responding to this very question prove that my mind is playing a trick on me by creating a response for me to interpret? I suppose my basic question is, is this entire situation possible, and/or is there a concrete way to disprove it?