Where do I go from here?

Is it possible that I only have fifteen days of high school left?  Only fifteen more days with my classmates I've known my whole life. With every day that passes my class and I get so excited because its one day closer to graduation. Sure I'm excited, but I have been having this sinking feeling in my gut. I don't want to start all over. I'm going to walk into a class of over two hundred, and not know a single individual. I just want my class of sixteen to last forever. I feel like most of them are my family, and I feel very special to have so many close friends. I still know that something more is supposed to come out of all of this. There are friendships that I will keep forever, and others that I feel could have been closer relationships. The not knowing of  what could have happened is what hurts me the most. Where do I go from here? How do I know everything is happening the way it should?