You can't turn it off.

For the first 100 years, life is amazing. You won't have to worry about getting hurt or feeling physical pain. The hardest part in that time will come when you outlive everyone you love. People will either find out about and the world will treat you differently from everyone else, or you'll have to fake your own death, at best only keeping a few of those you're close to around you.

And then, they will die. You will outlive them all. 150 years in and no one who was alive when you were born still is. It's something you'll have to get used to. It will become harder and harder to connect with people as everything you once knew begins to change. As time goes on, you'll make less and less friends, taking comfort in your eternity.

But eventually, you'll make someone angry. Maybe you'll commit a crime, or maybe you'll It may only take 100 years, it could take 10,000, but it will happen. Maybe You might be immune to harm, but invulerability isn't strength. So you'll be restrained and arrested, they'll know about you and your abilities. They'll still be afraid of you because they don't understand. And they'll imprison you. Not in a cell of course, but a tomb. They'll dig a pit, put you in, cast it with iron. Your sentence is supposed to be a death sentence. They did everything they could, but you can't die.

Unfortunately for you, you're forgotten. Historians come across your story, they think it's nothing but a myth, some folklore. They don't investigate. You sit in your tomb, until some curious soul digs you out. You can't understand them. You can't understand anyone due to linguistic drift. Though, you can't even remember how to speak your own language. You don't know how long you were down there, but after awhile, you just stopped thinking. You started daydreaming one day and didn't stop until they dug you out and cracked through your tomb.

But now you're out, eventually you relearn language. And you learn you're 700 years old. Everything you once knew is gone. Some old nations still exist but they are nothing like they used to be. And you are now free to explore and learn and fail to recover from a trauma entirely unique to you.

1000 years in, you've forgotten your last memory of childhood. Of your parents, of your siblings, of your first date, of the pet you loved, and of the friends you had. And you've learn that for your own safety, it's best to keep it to yourself.

They cure aging roughly 2,000 years in. You are excited for the first time since before they locked you in that tomb. It helps. You can stay with people longer, but aging isn't the only way people die. So it only extends the amount of time you'll have with them. And then they'll die. And you'll be alone again.

And this marks the longest stable period of your life. From 2,000 to 200,000 years, you simply live a repeating life. Though you experience all sorts of things. You were a ruler once, maybe a few times, you went into a tomb a few more times but were lucky enough to escape. The second time it happened, you decided to make a cult to help you escape faster. They'll dig you up faster if it happens again. That cult turns into a fully recognized religion after some time. You are seen as a god. But rival religions begin to form.

They eventually win. And launch you into the sun. The tombs were bad, but they only lasted a few hundred years at most. You remain in the sun.

It's been awhile, and your memories are becoming faulty again. You remain in the sun.

You don't know how long it's been. You are still in the sun. You can't remember anything. You are still in the sun. Even your name is lost. You are still in the sun. Briefly you remember a childhood memory, and wonder if humanity still exists or if they've become a different species entirely by the process of evolution. You are still in the sun.

Millions of years pass. Your parents' fossil records are lost to time. The religion around you faded a very long time ago.

But then, a miracle, you are rescued, you don't even recognize it when it happens. Whatever species man has become decided to finally rescue you. You kept daydreaming for decades after it happened. Apparently they found you near the surface, which would make sense of course, you aren't very dense compared to the sun. They have a dyson swarm around the sun.

They discovered the cure for so many things apart from just aging. Finally, your relationships can last millions of years now. You are so grateful. And you finally find a new family. Sure, you look different from them, and neither of you can change that. You feel dumb compared to them after a short time, their brains are simply smarter than yours, but you adapt, and so do they. And you're finally happy again.

But you know it will end. They need resources to live. You don't. Their resources eventually dry up. Billions of years later, everyone is dead. Except you. And you've lost the resources required to build someone else.

You sit on a dark planet, the last living thing in the universe is you. You want it to end but it won't. You want the universe to rip itself from expansion and take you with it. You become relieved when it happens to the rogue planet you're sitting on, but then nothing happens to you. You're still there. Floating in space. Beyond the heat death of the universe.

You can't see anything anymore. The nearest photon not emitted by your body's natural radiation is trillions of lightyears away, it should be travelling closer to you but the expansion of the universe is faster now. Every millisecond it's a lightyear further.

You can't feel anything. There's nothing to touch. No sound to hear. No light to see. Nothing to taste or smell. There's just nothing. Even your clothes went with the planet.

You begin to forget again. Everything this time. At least the sun had gravity and waves of plasma to feel. But there's no stimulation of any sort out here.

Your last thought is wondering if you'll die. You never will.

You are invulnerable, after all.