Notes from the Underground features a lonely, self-isolated, self-hating hermit who has spent the last twenty years of his life underground. However, this Underground Man has been alone, "always alone," for all of his life. His isolation seems to stem from an acute and paralyzing self-awareness. He expects the world to operate the way it does in literature, and after each inevitable disappointment he can do nothing but retreat back into his lonely world of books. Nursing a fragile ego, the Underground Man will often hate in return for being hated, which is not the quickest way to make friends.
The Underground Man chooses to remain underground in order to avoid other people.
The Underground Man has been driven underground by the callousness of other people; in a nutshell…it's not his fault.