Right, since there's very little story to go on other than "humans oppress furries" I can only go on your technical skill... and it's clear that you're very new to writing and you have a lot to learn. Try reading it over and picking out the problems before you read this next bit because I'll be pointing out all the problems and it can sound quite cruel. Just understand that I do want to read your story, but from a technical standpoint, you have issues.
Okay, first off, dont put information before the actual text. The information should already be in the text, also:
Thomas- The main character who received a surgery to have fox genes implanted into his body. He's 14, and going into his Freshman year of HighSchool. He is still getting used to his altered body.
How? How does a 14 year old get that kind of surgery? for what purpose?
When a new person speaks, you put it on a new line.
There's a lot of extraneous words that can be cut out, like for instance:
I heard the muffled voice of the mailman say on the other side of the front door
Ofcourse you heard him, we heard him too. Ofcourse he's on the other side of the door, he's the mailman, ofcourse he's the mailman, he's giving you mail, ofcourse his voice is muffled, he's on the other side of the door, because he's the mailman.
That makes him sound so agile, and then he falls flat on his face.
Also, he chipped his tooth and acted like it was nothing. It would be something you'd tell your mum about.
mysterious black letter
Don't point out that it's mysterious, make it feel mysterious.
It unfolded to reveal a long, formal letter typed in blood-red ink.
Who is this organisation, goths? why are they sending out black letters with red ink writing. No government body or respectable organisation would do that.
Dear Resident F-309TH (Thomas A. Hetcher),
If they know his name, they wouldn't write "Resident F309th"
This newly constructed facility named Segment 2-F
Again, they would give this place a proper name.
Enjoy your attendance to
Segment 2-F.
Why are the government being cheeky and insulting? they're normally more embedded in legalese and a firm wording.
Head of the U.S. Board of Education, Thomas Thatcher
Thomas Hetcher, Thomas Thatcher. Protagonist and antagonist with very simillar names is not good.
Was it a joke? Could this really be happening.
Too many rhetoricals spoil the story.
I heard the news anchor report in a grim, monotonous voice
No need for "I heard," no need for "grim," we already know these things.
As soon as I grasped the situation I calmly walked out of the kitchen
Why is he calm?
I said calmly
Too many calmlys, we know he's calm, even if we don't know why.
“What ever do you mean?”
Who speaks like that?
she went on
What do you mean, she went on? went on doing what? talking? cus I'd like to know what the characters say, unless you're talking about the previous chunk of dialogue which means "she went on" is in the wrong place. It goes before dialogue.
but she was nevertheless intimidating
Why is she intimidating thomas? He's not done anything, she should be reassuring him, not shouting at him.
she yelled as she shooed me out of the room.
Why?
Again, I would like to raed more since there's not much story to go on right now, but as it is, it's okay.