"Reiterating what Cabres said, it seems like the song is mainly about being unpopular. However, I don't believe that the climbing refers to climbing up the social ladder, but rather climbing in self-confidence. The message is that people must develop a sense of self-respect even when under the difficulty of..." (view)

"I think she's saying "You're a Zero" not "Your Zero" This song seems like one of the songs for the outcasts. Something for the people whom aren't socially "in". That's what I believe the reference to the ladder & climbing comes in at. Like climbing up the social ladder towards popularity...." (view)