I don’t know about that. I remember from when I was a kid, plenty of books about teenage runaways, teenage drug addicts, teenage prostitutes, teens in high school having a regular sex life, teens in high school committing murders, teens in high school having gay relationships, teens and pre-teens practicing witchcraft and sometimes not in a “cute” or “funny” way, etc.
About the only thing missing from the books was transgender because it was still at the stage of being a joke on situation comedies rather than a “teen problem” topic.