I am not a thug, AKA: what they pretend to be
I am just myself, AKA: my worst enemy

from Childish Gambino (Ft. Beldina Malaika) – Not Going Back Lyrics on Rap Genius

Meaning

He’s referring to how most African-American males act like thugs even though they’re actually pretending. He doesn’t conform to that and just acts like himself, which is self-destructive whenever he finds himself attractive to an African-American woman.

There is also an implied self-loathing in these lines—another pitfall for the young black male.

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