Lyric discussion by brendangalligan 

Cover art for Walls lyrics by Rocket Summer, The

To me, I think this song is about someone suffering through depression. It is very common for someone in a depressive episode to put up barriers to protect themselves and they often wear a metaphorical mask in public, just to keep up appearances and get through the day. The singer is trying to help the person overcome these self-defeating protections so that they can live life again.