I'm working on a novel right now in which I have an 18 yr old protagonist.

It's a dystopian novel about a futuristic version of the United States in which the country is in complete and total peace: no war, no crime, nothing. Behind the scenes, though, is a secret government initative that's actually the ones working to keep the peace. The main character, Riley, is recruited into the program when she graduates high school.

To me it feels very YA in nature. It's about a young girl figuring out about her birth parents and her past who's dealing with boy crushes and girlfriends and things like that. But she is 18. Is that too old to be a YA protagonist?

And if this isn't a YA novel what is? Regular fiction? Sci-fi? Fantasy?

Any help would be appreciated