Time travel isn’t possible. I know this is all theoretical, but I’ve already worked it out in my head in a LOT of mental scenarios.
The first question is whether you’d retain all of the knowledge that you have now. Of course, you could not have knowledge of something that didn’t happen unless there were some strict “destiny” that isn’t alterable, which is a horrifying prospect. (I’m looking at you, Calvinists.)
The second issue is that future knowledge would do you no good if retroactive decisions you made in the past change the future.
There are some modern philosophers who logically posit that the past doesn’t even exist.
Still a fun exercise.
The past doesn’t exist beyond what I experienced, so all of you who think you know something from “some earlier time,” “before me” are experiencing figments of imagination.
Prove me wrong.