I believe that I am the only thing that really exists. I think that my friends and people I meet are versions of myself if I had taken a different path in life. I could be anyone and I can understand even the most ridiculous of ideas. It seems like a negative view but I am convinced that everyone or everything I encounter is to benefit me in some way. I don't believe in good or bad. Nor emotions or science. Just nature. I was created and all I am here to do is survive as long as possible. Period. No silly questions about the meaning of life or what is my purpose or am I a good person. Life isn't a gift it was just something that was possible and eventually happened. I think people like to lie to themselves to forget the fact that they are basically useless. I apologize for making this sound negative and too long. I guess my question is how can anyone prove to me that they really exist?

Your question reminds me a little of the story Bertrand Russell told about the philosopher who claimed that solipsism -- the view that only you exist or anyway that there is no reason to believe anyone else exists -- was obviously the correct position and she couldn't understand why everyone else didn't agree with her! But there does seem to be a sense in which you cannot prove that anyone other than you exists. Actually, in that sense, it also seems that you can't prove that you existed in the past or will exist in the future. So you if you have standards this high, then the most you know is the content of your current experience, though even this may be saying too much.

Does the future exist in any knowable fashion? If so, can it be known in any absolute way? If not, why do so many of us believe it can?

On one view of time, the future is as real now as the present or the past, much as other places are as real as the place you happen to be; on another view the future is not yet real but will be. Either way, many philosophers would say that we can know some things about it, though Hume's great sceptical argument against induction attacks this idea. But Hume's argument is not especially about the future: it applies to any inference from what we have observed to what we have not observed, whether what we have not observed is in the future, present or past. In any event, it's not very surprising that we believe we can know something about the future, since we have so often formed expectations that we have subsequently found to be satisfied.

Could there ever be any logical basis for the thought: "I am untrustworthy"?

Clearly I may know that I tend to mislead others. Could I also know that I tend to mislead myself? Well, the complexities of self-deception aside, I may alas have ample empirical evidence that I am incompetent on a wide range of subjects.

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