Descartes

Descartes siad "I think therefore I exist." After thinking about what Descarte said in more detail I realized that it has to be true. If one thinks, how can they not exist? But then I got to thinking, is it possible that I am the only one who exists. Descarte also called God the great deciever. Could it be possible that ones whole lifetime could be a dream, and that in reality they are the only one who actually thinks and exists. I guess you really never know, but it is scary to think about.