I'll be honest, the youth of today is my favorite audience. They're so impressive! I've been speaking specifically to youth, professionally, for about 4 years now, and they've been very receptive. Just like any other audience, they really just want to know that we care, yes even 13-17 year olds.
Unfortunately they're being lied to, and it starts as they enter 5th or 6th grade. They're are certain things they learn from friends or society that they perceive as making them "popular" or more engaging. They often have a false perception that this behavior will make them happy. I address the insecurities lying beneath those behaviors, without becoming invasive or shaming. Shaming only perpetuates it. Add in some good humor, and a few media references, and they're putty. My training with youth in extensive.
I've found that most young people want to know two things:
1) That they're making someone proud.
2) That, especially when things are hard, they're not alone.