When Did We Grow Up?

So, the other night as I was showering with a roach (yes, that is right, a roach) I began to contemplate the complicated nature of life and wondered when did this start. Five minutes ago I was a bratty teenager who couldn't wait to get out of the house and go to school. Then in the blink of an eye you find yourself graduated, married, trying to split up the holidays between two families, working to pay the bills and hoping you break even. I found myself even more grown up recently. I found out last week that I am having a miscarriage at about 3 months along. First off, who on earth said that I could have a kid! I am a kid! Second, a miscarriage is an adult thing your parents talk about but it doesn't actually happen to anyone you know! The odd thing is that I am totally calm about this, not really upset because it seems to be the natural way of life. So the question I pose to you is when did this happen? When did we stop being pimple faced (I wish that part had gone away) teenagers that had really not a care in the world beyond feeling insecure and unpopular. When did we cross that line into true adult life? Is anyone else feeling this? These are my random thoughts. Make of them what you will...