Interesting Points
I can not accept that there is no free will, either. I do agree that teenagers are still in development from childhood into adulthood, a process that for some can continue for longer than others (some still act childish when they are middle aged). Teenagers are also going through a time of experimentation with who they are and what they want to do; while also dealing with peer pressure.
I tend to reference movies, it is easier for people to understand the point. In the movie "A Beautiful Mind" the main character suffers from mental illness and he sees and hears people who are not real. He makes a choice to ignore his hallucinations and he checks with people who he trusts to help him verify a real person or hallucination. The same goes for alcoholics who choose to work at being sober, it is a choice and it is not easy.