Trow them in jail! The sinfull law-breakers!
At 17 you're not an adult, I agree. But you aren't a kid either. Stop tendering "the children" so much, let them make their own mistakes goddamnit, they need to learn to fall and pick themselves up again.
This doesn't mean you should ignore them, you should be there for them whenever they need you, but most of the time they don't need you, they want to be left alone, they want to be young.