You are right; some of the text is way too small (and blurry). You may want to rethink your format. It’s unreadable on my phone.
AJ – Since she is commonly known by this name, you can leave out the periods after the initials (eg. JFK).
Copyright notice: Capitalize “fighting” since it is part of your title. “Within” is one word.
Author Message: comma after “psychopaths”; comma after “older”
“Underage” is not a noun. Replace with “underage person” or “minor.”
Spelling “psychotic”
Normally, you’d put hyphens on ages “16-year-old.”
“for the words of your all powerful”
“a familiar sight”
“self-defense”
“Now there are a few basic rules.”
Comma after “Now when we get in there”
Comma after “Don’t lie to me” – You are missing a lot of these direct address commas, so here’s a link for explanation: https://www.grammar-monster.com/lessons/commas_with_vocative_case.htm
“The stream is a go . . .”
Comma after “game system”
Comma after “filled with shills”
Who is saying, “I think he’s just upset about having to repeat middle school again?” The speech bubble is pointing to Donnie.
“I still wasn’t able to go through with it.”
Comma after “Say again”
Comma after “What was that”
Comma between the two “You’re right”s
Comma after “genius”
Comma after “I’ll be home soon”
Comma after “Ya know”
“Ashley, right?”
“That’s your name, isn’t it?”
Delete comma after “Hooow”
“that is your name, right?”
Comma after “If I listen”
Comma after “wanting to talk to me about”
Comma after “you’re troubled”
Comma “believe the lies, which get spread”
Spelling “Awesome”
Comma after “Well”
Comma “on the sink, which dispensed it”
Comma after “you know”
Comma after “mood today”
Comma after “my terror building speech”
Apostrophe “’Cause . . . I’d be pretty upset”
“But that’s beside the point!”
I would change the comma after “a lust for pain” into a semicolon ; for clarity since it’s coming right after a list with commas.
Comma before “which”
“They’re too deluded to accept facts, let alone hear them.”
“My parents fell for the lies and trust me.” This sentence is confusing because it sounds like the parents trust AJ. Perhaps “My parents fell for the lies. Believe me, I’ve tried to change them.”
Comma after “Once a shill”
Spelling “Surely, you know this.”
“the ‘rents get back, lest I go even crazier.”
Comma after “get you”
Comma after “weirdness”
Comma after “thanks”
Comma after “What do you want”
“you were just talking to” – It looks like there’s a misplaced apostrophe there.
“That was Cameron Pierce, a former flat earther.”
Comma after “A few weeks back”
“Today we met up and discussed, and I managed to change his mind.”
Comma after “What is it”
Comma after “Turns out”
“She chose her path a while ago.”
“And she wants me to join her”
Spelling “I overheard your conversation with Lucy.”
Comma after “We talked about this”
Comma after “By the way”
“decipher” – I don’t think that’s the best word here.
Comma after “trying to get better”
Comma after “Oh”
Comma after “my imagination” instead of a period
Comma after “That’s sad”
Comma after “Well”
Comma after “dark thoughts” - Shouldn’t it be Donnie changing AJ, rather than AJ changing Donnie?
Comma “A friend, you say?”
Change the period to a comma. “If you wanna thank me, could I spend”
“Morons” – no apostrophe
“Deep within the burrows”
Comma after “experiment”
You are alternating between pronouns it and he for Jerry. Pick one and stick with it.
“what you were programmed” – misplaced apostrophe
Comma after “I’m hungry”
Comma “My god, you’re stupid!”
“There are many more issues”
“Quite the “issue,” ain’t it?”