Heh, I'm 20 and already I can feel time ticking by at the speed of light. I know how you feel but maybe a bit worse.
I thought to myself yesterday "I'm 20 and don't really have anything to show for myself". Hell the likes of Mark Zuckerberg, Bill Gates and Steve Jobbs had already accomplished so much by this time.
What am I doing. I can't imagine and nor do I want to imagine being 36, atleast if you feel accomplished and that you've spent your 36 years enjoying yourself then you don't have much to be unhappy about.