[varius]

You haven't been around teenagers, or even humans in general much, huh?

Teaching another person, even an eager one, how to change their behaviour and mental patterns concerning validation and FOMO is a really hard task. It's not knowledge like math or something that you can just pass onto them. It can take months or even years even for pros (psychitrists etc.) to do that. Combine that with the fact that teenagers brains are wired differently (their need to fit it is greater than that of an adult) and their "natural resistance" to adults' teaching and it becomes almost impossible task.