Well you really missed the entire point of the show and summed up your ignorance of it pretty aptly.

It’s about way more than your surface observation. If you’ve been through addiction then it’s probably a show that will really resonate with you. The aim is not to watch adults pretend to be teens, it’s to watch people you can sympathize with, go through an incredibly difficult age and deal with a collection of problems that you’ve had before. If you’ve been through drug culture and made it out the otherside, you will recognize a lot of the characters as people you’ve known, or been.

I get where you’re coming from, but the reason I like it so much is it addresses so many issues I’ve had to deal with, or know people who’ve had to deal with them. The way the main character describes depression and anxiety, the way they keep trying to be better but ultimately repeat the same mistakes when things get bad, it makes me feel like someone finally understands what I’m going through, which is comforting. There are a ton of other heavy topics addressed, like drug abuse, anger management, gender identity, sexual orientation, and more, and I felt like it was done in a really good and non-judgemental way, where it wasn’t like the writers were trying to tell you some “moral of the story” but instead just acknowledging these are real world problems and that life is really hard.