Lyric discussion by NeonDragon03 

Cover art for Monster lyrics by Imagine Dragons

I see this song as a person being abnormal and being so terrified to show it to society that it builds up inside and creates a hate-filled... well, monster. They become so isolated that it just keeps growing and they're too scared to tell anyone because they think they'd be labeled as a freak so they try to be normal and fake it but they hated being 'a pretender' and having to act as someone so very different than what they truly are. They begin to think it's their fault. It seems like a horrible trait to them so they're afraid to show people the real, true, flawed but somehow perfect person they really are.

My Interpretation

@NeonDragon03 sounds like me