don't worry, some people just mature at different times to others. Plus loud people often feel the same and just act like they don't.
My parents gave me quite a free reign, so when it came to underage drinking, smoking or whatever, I wasn't really that interested as I knew my parents would let me drink so long as I did it safe and responsibly and at home (not smoke but I have asthma so it wasn't as option). My other friends however, especially those on a tight leash, were sooo excited about the first piece of freedom they got. They were all woo lets go out and get **** faced! whereas I was more like what's the point?
I often feel as though other people are more comfortable with freedom. i didn't apply to university this year unlike all my friends, because I didn't feel ready. I often feel like I'm 15 (perhaps because people think I am due to my height and youn-looking face) but I don't really want to 'grow up' either. I love dressing up and watching kids TV - but what's wrong with that?
Does going out and getting ****-faced make you grown up? owning a car and working in a job you hate to buy things you need to impress people you don't like, as the saying goes? that just seems so silly to me.
Just be happy with who you are. **** everyone else. - you spend your childhood wishing you were a grown-up and your adulthood wishing you were a child - so forget what other people are doing and do what you feel comfortable with.