I think the song is similar to "Agoraphobia". In fact, most of the songs on Microcastle seem to be about the phobia itself. The way the lyrics are make it sound like a person with agoraphobia but who does not know there is such a thing. They try to describe the way they feel to others but they can't. They don't realize what triggers their fear. They just keep to themselves in their own "Microcastle" (their home).
I think the song is similar to "Agoraphobia". In fact, most of the songs on Microcastle seem to be about the phobia itself. The way the lyrics are make it sound like a person with agoraphobia but who does not know there is such a thing. They try to describe the way they feel to others but they can't. They don't realize what triggers their fear. They just keep to themselves in their own "Microcastle" (their home).