Java342

I was playing with my friends online in Minecraft, like always. I didn't think anything bad would happen at all; I heard stories of Herobrine, Null, and others. But then I saw a sign that said, "This is just the beginning." I thought it was a prank that my friends made and moved on; all my friends left. I was alone, and I was fine with it. But it was eerie. I felt not alone, but then I saw a sign that said "false."This is where things got weird. I got back to my home, but I saw a cobblestone block. I thought it was always there, but then I thought of it. And I remembered that there were no cobblestone blocks before I got into the house. I broke it, but then. I saw a big pit leading to a cave.
When I jumped in, there were mobs and all of that. But then I saw a figure in the distance, like a player. But no one was in my game; only friends could join my game. There's no way they knew the address. It didn't even tell me that a player had joined my game. I approached him, but he disappeared. All of a sudden, my inventory texture changed to the texture of the Steve skin. I tried to get out, but I didn't have enough blocks to get up the pit.
I was pretty scared, so I tried finding another way out. But as soon as I found one, my PC restarted. As I booted back in, my desktop wallpaper changed to Steve staring at the darkness; it could be the entity. I booted up Minecraft and got to the server, and things have changed. Instead of my house, there was a sign saying, "No more house. Live alone. Starve to death." after that.
I left the Minecraft server and then quit playing Minecraft. And got to bed.
I woke up to a beautiful day; I got to minecraft. And I went to my server, and I forgot about the entity, but my friends weren't online. I tried contacting them. But they weren't responding, so I got to the forums and talked about the problem. But then someone messaged me on my Gmail account. I went to check; it was by someone named "Java342." The subject was "?" and they said, "Unlock me from there. Let me in." I was creeped out, then my Minecraft forum post was deleted. Then, I kind of forgot about it. And then I edited my story. But then the file was corrupted. And wasn't able to open. I tried it many times, but nothing. I opened it in Notepad, and it said "false.". I remember it; it was the thing that started it. Then I opened my world in Minecraft; my name was "342,"  and I spawned in a cobblestone box. With one sign saying, "Stuck?". Then the soundtrack "Cat" played randomly, and I quickly quit my world. And got to another one, the same thing. It was in all worlds. Then my PC closed all the programs and shut down. It could not turn back on.
Ever since that day, I bought a new computer. And everything was running fine; my friends are online. However. I will still remember that day.