Is it just me or does this happen a lot (cont'd)?

Is it the norm for people who had kids very young (teen years) to treat their children like their friends or acquaintances? When I was born, my mother was 18 and my father was 16. I am 22 now and it seems like my parents don't view me as their child but as a friend. Is it a psychological thing on their part? Is it because they never had the chance to live like a young person and they are living in the past?