I have a recurring dream and I'm wondering what it means?

I'm 23 and I have the same dream every night. I'm always back in high school or junior high, and I can never remember what class I have next or where it is. I also have dreams where my class just ended and I spend the entire dream just trying to fit all my books and utensils into my backpack, but i never finish, there's an endless pile of books, pencils, notebooks, and whatnot. I have one of these two dreams every night without fail, for the past 4 yrs (i graduated in 06). What do they mean?