Im a senior!

So I am starting to realize that i am really close to graduating. It makes me happy cause i wanna be out of high school, but then again I am getting scared because i will be on my own.... i have to apply to colleges and for scholarships.... I dont know if i can do this by myself... I need help. I have a feeling that i will not talking to most of my "Best Friends" after high school... that does not make me happy becuase i grew up with them.