Thing about Time travel is we can't fix past. I can only correct myself towards future and not past. I'd say to my 20 year old self, you'll have your worst time, but I am going to correct whatever didn't worked out to you. I know 50% of your health and 90% of your brain will be mine. I promise I'll fix career and whatever life left of it. XD
you are getting it all wrong. true.. the past can't be fixed or changed, but timelines can be changed. a letter to 20 year old you could cause a time convergence, its a typical senario of changing timelines -not changing the past.
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