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.
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.
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The most difficult thing is the decision to act the rest is merely tenacity. The fears are paper tigers. You can do anything you decide to do. You can act to change and control your life and the procedure the process is its own reward.