I feel this way sometimes. There are days that I hear things when I'm in class or see something fly in the corner of the room. Shadows that fly by catch my attention, but when I catch sight of it, it disappears for a moment.
I'm not exactly as insane as I make myself out to be in the poem. But you never know . . . sometimes I do think I'm crazy. That or I have a wild imagination and get way too into the fictional world I come up with in my weird noggin.