This story grabbed my attention, because of it's title. 'Suicide club', the title reminded me of a Polish movie 'Suicide room', and since I like that movie, I decided to immediately read the story. And thank God I did! It's great. The way chapters are written, one for each person, so far Lorraine and Cameron, is amazing. Because of it, the reader can get into the character and her/his story. Though, I'd advise to put some emotions in this. You wrote why they want to kill them, but it would do good to the story if we'd learn a bit more about the emotions built inside of each person. That would be great to do when the chapters about killing Lorraine's and Cameron's parents will take a place. Maybe, just a small idea, you could do some retrospection in the story, to show how they - parents - ignored Lorraine and Cameron, or whatever else they were doing that led both teens to join the club and plan such killing.
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In chapter one, the first paragraph, I'd divide it in smaller paragraphs, starting with:
Lorraine checks the clock. 3.19 A.M...
At exactly 3:30...
Then separate sentences said by Cameron in the first paragraph. All this paragraph is too long, separate it - just a small advise.
I think you have an error in chapter 3 - Cameron. You wrote that he goes with Ivy to her home, but then you write 'Would you kill your parents?' Lorraine screams and throws her hands into the air" - Shouldn't it be Ivy who screamed?
You're just sixteen and you write amazingly for your age, dear. Hopefully, I'll get to see some more of your writing, especially this story.