I wanna be different, I wanna do it good
Not another actor turn rapper in movies bout the hood
Niggas say they want the real, but get mad when they hear the truth

from Childish Gambino – Untouchable Lyrics on Rap Genius

Meaning

He wants to be different that the leagues of actors who turned into actors, or vice versa.
He doesn’t see himself as like Ice Cube in ‘are we there yet’ or Eddie Murphy’s ‘Delirium’, because he honestly enjoys what he’s doing in both areas.
He is honest in his rhymes which is why he gets mixed reviews, although lately they have been more positive since more critics are taking him seriously.

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