No. They are not, nor are they capable of sustaining themselves on an adult level either physically or mentally, but you are young still and young folks need to think that way or they'd never leave home. That belief will sustain you through your self-defining years and hopefully all will go well with you. By the way, I don't need to "Check" when driving normally starts since I have taught my three adult children to drive. Normal 15 year olds are very capable of rational thought married to irrational behaviour. That is why the age of responsibility is so problematical. Sometimes it takes a while to work this stuff out. Adults are important transitional figures for young people, and violating the child even if the child "consents" is not about what is good for the child but about what is good for the adult. It tends to get in the way of the growing up process. But you already know that. You are probably just jerking chains. And no, you are not crazy, just sorting things out.
regards