People can try to reinvent themselves. I don't think you can really change who you are though because who you are is pretty much where you came from and what you've done up to now.
But if nothing but soul or in soul mind is qualified to count it is impossible for there to be time unless there is soul but only that of which time is an attribute i.e. if change can exist without soul.
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I don't think the human mind can comprehend the past and the future. They are both just illusions that can manipulate you into thinking theres some kind of change.