Guilty as charged. I grew up the third of four siblings. My brother had to climb onto the roof to adjust the antenna so that we could get channels besides CBC. If the picture was clear, there wasn't any sound, so me made our own voice tracks, like Mystery Science Theatre 3000(before it came out).
I had to look up Westerfeld, Leviathan and the Uglies. My younger daughters (tweens) might like these series. Yes, it's between SF and mainstream with that feeling of strangeness. Bruce Sterling (cyberpunk) thought up the term. The genre has been applied in hindsight to past work as well. Like any category, it's fairly slippery.
50 to 60K is the standard length for young adults (for Youth readers 40K words), however, teen novels have been much longer. I can think of several examples.