Who.what.where?

I've been sinking deep in my mind Tryna figure myself out Cause I'm a walking paradox, cause I'm a walking equation, that not even science has an explanation for Am I crazy or is it normal? Am I crazy or is it normal? Cause I can't have it no more Yeah, I've been sinking I've been thinking deep in my mind, tryna figure myself out Cause I'm a walking paradox, cause I'm a walking equation, that not even science has an explanation for I feel like I've done this before, so why am I clueless? I don't know shit About life I feel like I've been here before Yeah I've been sinking, I've been thinking But I feel like I've been here before, but I feel like I've done this before Why do I feel like an amateur I feel like I've done this before I feel like I've been here before I feel like I've done this before