My theory is that the song is about fake friends. Especially the line where they mention 4 years and tormentors who "keep them alive" and "pretend to be nice". 4 years can either refer to highschool in the west or college anywhere else, but I can say that as someone whos paranoid, i do tend to keep up a "fake" personality (not to say it isnt real, but i tend to make myself like what my friends like so that theyll like me more.) i tend to think my friends dont actually like me and just keep me around ut of pity