I think this song is about someone who is very experimental, explores freely, possibly uses drugs, and learns things solely by experiment. When he says "But you don't know me", he's saying that people are quick to pass judgments about him based on his experimental, alternative ways. "Complete inhuman" is simply an exaggeration of that judgement.
I think this song is about someone who is very experimental, explores freely, possibly uses drugs, and learns things solely by experiment. When he says "But you don't know me", he's saying that people are quick to pass judgments about him based on his experimental, alternative ways. "Complete inhuman" is simply an exaggeration of that judgement.