Most stuff is never allowed to visit. Various remote sensors and controls probe the alien expanse beyond your secluded prison abode.
You may never leave, or at least, no one has yet successfully escaped to tell the tale. Some have gambled fortunes that such an escape is inevitable in post mortem preservation of a rogue self.
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You are, objectively, not your mind. The brain is just another organ that specifically evolved to better help your “bone prison” survive. That it sometimes comes with unpleasant side-effects like existential dread is a trade-off that was deemed acceptable thousands of years before you came to existence and one which you have entirely no control over.
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