Ok so I read the first chapter of your book and you have a great idea going, I think I only saw like 2 grammar errors but the only thing is so much is happening at once. Matt has anxiety then talks about his sister then has a Panic attack then his parents come in then he goes to school and then he sees the girl.
It's a lot to digest and understand and can make it very confusing.
So what I would do is break it down
All those things that happened in chapter one make them into a chapter of there own and go into detail
Once u accomplish that I think your book will go a long way!:)