I feel like I'm really alone in my feelings about this book. I quite enjoyed the smart, clever writing and Josie's characterization in terms of being brilliant and not portrayed as a weirdo. 
 HOWEVER... 
 I have insurmountable issues with the lack of consequences for the adults' behavior, which is a real trigger for me. In particularly, Josie's sister tries to physically change her (contacts, falsies in her bra and more) so that she fits better in her wedding photos and there are basically no consequences of substance for her actions. And I guess this is pretty true to life, because in the real world teenagers get crapped on by adults and told it's for their own good all the time, but it sure irked me in this story. There's some reconciliation at the end, but it was too little too late for me. 
 I also wish there'd been more development of the relationship between Josie and the ultimate love interest. 
 Anyway, everyone else thinks this is wonderful, so this is probably a me thing and it's likely your mileage will vary tremendously. 
 Also, I'm not getting the John Green or Rainbow Rowell comparisons in the summary. I do think the writing style and clever narrator will appeal to John Green fans, but it's a bit of a stretch and the Rainbow Rowell comparison seems really off, since the writing is extremely different than Rowell's.