Chosen

The idea for this came from the webcomic XKCD, and does borrow heavily from it.
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I don’t know why, but I was chosen.

It started out small. I was 8; by all means I was a child; a nobody who was as antisocial as you get. That’s when HE showed up. He wore all dark clothing , save for a little yellow pin, in the shape of a phoenix. He told me I was now inducted, and I would be contacted again.
I thought it was a mere joke, and through the years I had almost forgotten of the man in the suit. That would soon change. Coming out of a class, I was spotted once again. A shorter man, dressed in almost all white. And a phoenix pin.
Once more I was told my orders were soon to be granted, and I seemingly nodded; not a word from my mouth. I was now part of something bigger than myself, and it matter not what it was, or even what it meant. For once, I was a value.
It would not be long this time till he showed up yet again, the short man with the phoenix pin. He said but not a word; his hand held all the answers. In his palm was my single mission; one that was not to be mistaken. We shook and carried on, as if acquaintances. I would not review the slip between my finger until I was safe.
Once in the Union of my University, I glanced at the note. It was merely an address [241 Phillis Pl.]. I knew nothing of the location or even what to do, until I left for home, where I found three matches, neatly placed in my mailbox. And kerosene in the bush.
The house meant nothing to me. I knew no one who resided in it; the entire street offered no familiarization. Beyond the knowledge it was vacated, I knew nothing. All I had was an order, and it was now complete. The red and yellow burst from the house in seconds, and a blazing feel of pure heat rushed over my once cool hands. When the crews arrived, I was gone.
I still know nothing more of why I was selected, or for that matter why I did what I did. It mattered not whether I was good or evil; all that mattered was there was a box containing a yellow pin, in the shape of a phoenix, laying on my bed.


And I was to soon deliver orders to the next chosen.

I liked this. Its different.
Though I did find it slightly confusing. I had no idea what was going on and because of that fact it didnt completely grip me. I think a bit more detail of the men would give it a stronger feel and also the surroundings and situation the character is in.
I also thought it sounded a little rushed, if you expand it a little it may broaden the mind.
However, I did like the mystery of it and the idea of not knowing what was happening to the character.
Good piece of work

First things first, you used a lot of tildes (~) to separate your notes from the story, and they stretched the page. In the future, you might consider using fewer tildes (three is usually enough) and centering them using the [ center ] codes. It will look neater.

I was eight; by all means I was a child(,) a nobody who was as antisocial as you get.

When writing prose, it's conventional to write out numbers less than one hundred. Also, semicolons are used in the same way periods are; they separate independent clauses. While "I was eight" and "by all means I was a child" are independent clauses (meaning they can stand alone as their own sentences), "a nobody who was as antisocial as you get" is dependent; using a comma is therefore proper.

I thought it was a mere joke, and through the years(,) I had almost forgotten of the man in the suit.

The words I've underlined struck me as awkward. I'm not sure "of" is the correct preposition to use there; "about" feels better. "Through the years" implies that whatever it was that was happening then is still ongoing. It also strikes me as being unnecessarily vague. Something like "after X years" would probably work better.

Another thing about "throughout the years": you have it acting as a lead-in to the rest of the sentence. Whenever you have a phrase that acts as an introduction or transition, you need to separate it from the rest of the sentence with a comma. For example, this sentence has "for example" acting as a transition, which is why it is set off by a comma.

You'll also notice that I crossed out "mere"; that's because it's an unnecessary modifier that just bogs down your writing. Jokes imply a lack of seriousness, so "mere" is quite redundant. Having unnecessary adjectives and adverbs in your sentences tends to make them longer and more awkward to read, especially if they are redundant. I suggest going through this and taking out as many modifiers as possible; it will help make your writing more concise and easier to read.

For once, I was a value.

This sentence made no sense to me.

Overall, this story struck me as far too vague. You skimped out on a lot of details in favor of creating a sense of mystery, only that sense of mystery fell flat because there was so much, too much, left vague and ill-defined. One example of this is the phrase "through the years"; by incorporating mentions of set time periods or events, making them feel more solid and grounded in reality, you can create an air of mystery without leaving your reader floating in a vague sense of vagueness. Having some specifics acts as an anchor for your reader and makes your story more enjoyable as your readers can more easily imagine what is going on.