I know exactly how that feels. I couldn't believe it when I woke up one morning and my childhood was officially over. Its an insane thought. But it doesn't always get worse, getting older. At least, from what I would say. It definitely is more challenging, but its what you make it that matters in the end. I personally love being an adult, I like the freedom and the rewards I have gotten from things I have made that I never would have in my younger years.