I am currently writing a teen boy character, and I’ve been looking in to how they think and act. In a sense, I am inherently writing from the viewpoint of an unreliable narrator, because there are deeply irrational thought processes as work here which, unless you are under the influence of a powerful cocktail of adolescent hormones, you must stretch to understand. Slate published a series on risk and the adolescent brain last year that has been helpful. Basically, if you are writing a character with normal logic who is 16, you are not doing your job as a YA author. Check it out: