Firstly, so you know, I don't usually read this genre.
Read the story now
I do think this story is very age specific, YA; whereas some YA can tip over into adult. It is quite a lovely story describing the protagonists love affair with books as well as a blossoming love for a young man. Some of the dialogue is a little stilted in parts, but can easily be dealt with - for example, Chapter 21, the three way conversation between Johnnie, Nathan and Nichol is a wee bit confusing and loses it's realism - if you add more dynamics; explosions of emotion (they are teenagers after all), descriptions of Nichols internal dialogue in more depth, would open it out more. I like the character of Nichol, her self-deprecating, slightly sarky nature - more of that would add colour to this character. This is a girl with a pretty sharp wit, has learned to be self-contained, loves literature, is a loner - possibly she could use quotes from books she has read as a defence mechanism? I didn't know teens discussed sex before they had it, these days, but it's nice to read that they don't all just get drunk and go for it (I'm from England too!!) Not sure where the story arc is going, but maybe needs a little more 'action' earlier (no, not sex!) I would also like to see more contrast between her love of books and her growing love of people.
Some editing and polishing will bring this to a satisfying finish.