I also think this song is about suicide. My favorite part, "What if I fall? What if I don't?" makes me think this.
She's thinking, 'what would happen if I were to take my life (to fall, in a sense)? What would happen if I kept on living?'
"And holding up this fortress With imaginary forces" -- She's trying to find reason to live, continue to live, keep up her citadel. The imaginary forces are the reasons she invents to keep living, but they're only imaginary. She knows they're nothing.
I also think this song is about suicide. My favorite part, "What if I fall? What if I don't?" makes me think this. She's thinking, 'what would happen if I were to take my life (to fall, in a sense)? What would happen if I kept on living?' "And holding up this fortress With imaginary forces" -- She's trying to find reason to live, continue to live, keep up her citadel. The imaginary forces are the reasons she invents to keep living, but they're only imaginary. She knows they're nothing.