Time travel is a popular concept within fiction, after all who doesn’t want to see the past and maybe even correct its mistakes. But I not only doubt time travel is possible, I also doubt it’s even worth it.
Think about it, depending on how far back or forward in time you go, you might not be able talk to anyone because they won’t understand you, and your identification and money may be useless in the time you’re in, which means you won’t be recognized as a citizen.
Then there’s the whole changing the past and future thing. If you could go back in time and stop something bad from happening, then what? Wouldn’t something else that was equally bad happen as a result, maybe worse? And who knows, even if you tried to change the past, would it matter anyway? Would the thing you were trying to prevent happen find a way of happening, regardless of your attempts to prevent it?
And so what if you could prevent past mistakes in your life and make your life free from mistakes? Is it really worth it? After all, your whole life might be colored by your mistakes, but it’s not just in a negative way. Often, your mistakes can also have a positive side-effect, and make your life kinda interesting. How you deal with everything in your life is unique. Do you really want to change the unique tapestry that is your life?
Not to mention, if you could time travel, you would actually age faster. Suppose you were on a mission that took about a year to do. Even if you did it and went back to the present, you are still a year older. Remember, time machines don’t change your age. And depending on how many times you use time travel, you’ll shave several months and years off of your life and miss precious moments of your life that you will never get back. Come to think of it, lord knows how much Bill and Ted must have aged between every time they travelled through time in Bill and Ted’s Excellent Adventure.
The irony is that you could try to change the past to make a better present or future, but you might never be able to see it all, and miss out on your own life all while potentially becoming an old man in the course of only so few years. Travelling to the past to save the present and future, along with travelling to the future to see it and then go further back to try and change it, thus becomes a massive act of self-sacrifice of not only no reward to yourself, but potentially little benefit for everyone else, considering you might have potentially made things worse in the process of screwing up the tapestry of history just for a happy ending.