Need help finding a YA book

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Need help finding a YA book

1torinabells
Nov 23, 2021, 7:29 pm

I'm trying to find this book I read sometime around 2010-2014. It's a YA book about teenagers who are physically assigned a gender at birth, then when they reach a certain age (16 or 18 maybe??) they get to choose which gender and body they would like to have for the remainder of their life. The MC is female to start and her best friend is male. I think they all have numbers for names. MC and friend might be Four and Six? (But that could be wrong) I think I remember something about them being raised in groups of ten. The age to choose is coming up soon and MC is thinking that she might switch to male. Then MC and friend go on adventure/ mission and she realizes that she likes being small because she fits in the arms of male friend and they fall in love. MC chooses to stay female.
That's about all I remember. If anyone can help me out that would be great! I have been searching for this book for years.