Why does Jon Krakauer compare himself an McCandless

Jon Krakauer is the author and narrator of Into the Wild, whose life in certain ways parallels McCandless’s. Obsessive about mountain climbing from his teens to his late twenties, like McCandless he also has issues with male authority figures, and has a very conflicted relationship with his father.

http://www.gradesaver.com/into-the-wild/study-guide/character-list/