graduating next year

as the title says, I'm graduating next year and i'm a little down. i'I'mm terrified of moving on in life and I feel sometimes that I haven't done enough teenagery stuff to warrant moving on but I also know that that doesnt make any sense because the "teenagery" stuff only happens in movies or to those who peak in high school. I know i can do anything i want in life but i still feel sorry for myself. Asking for advice. please help if u can, it would be very much appreciated.