200 BPM started off as a series of personal reflections on love, life, religion, music, sexuality and pop culture. It was never intended to be a plot-driven novel. It's admittedly a very random book. But that's how our generation lives. How we think.
Information is a double-edged sword.
Kids are making adult decisions sooner, coming of age quicker, and feeling a flood of pressure to keep up. Yes, that's pretty much the way the crew I run with speaks. Definitely it wasn't painstaking work constructing the dialect. Of all your characters, the two relatively sane, relatively responsible, relatively intelligent ones happen to be budding queers. If it seems that way, it's completely unintentional.