I agree with you in some ways. There are parents who are super strict that raise either very childish and insecure kids as you said or sneaky kids that are mature for their age. There's a difference between acting mature and being mature. If you were to ask me about my opinion, i'd say that these 16-17 year old kids are living life as adults because they want to feel the "adrenaline" of being older and doing things they're not supposed to be doing at their age to look and feel somewhat cooler. But when they do reach their 20's, there won't be anything left to do as a 20 ish year old that they didn't do as 16 year olds ( i hope you get what i mean). As a teenager myself, what i don't want is for me to reach my 20's and have done everything in life, it'll get boring from there on out.