Why are teens so immature these days?

I am not being arrogant or anything, i am simply just asking because i don't get it. I don't socialize with the fellow youngsters other than on rare occasions, so i didn't think it was this bad, but when i met some teens just a year younger than me, they were just so immature and just seemed to be lacking any intelligent life. They were doing an exam, and kept asking their teacher stupid questions trying to be funny, and made some really immature arguments with him. Then there were some boys hanging at a school hall, drinking energy drinks and acting all "cool", arguing with a teacher about smoking. Why is this? Anywhere you go you see stupid and immature teenagers like this, but why?

And i am aware i am a teenager too, but i happen to be nothing like that.
Why are teens so immature these days?
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