We live in a world, we live in a world on two different axles
You live in a world, you living behind the mirror
I know what you scared of, the feeling of feeling emotions inferior

from Kendrick Lamar – Bitch, Don't Kill My Vibe Lyrics on Rap Genius

Meaning

To be in front of a mirror is to obviously look at your own reflection. Kendrick accuses other artists of standing behind the mirror (ie. not being honest with their view of themselves). He suspects they shy away from introspection because they are afraid to investigate weak emotions inside themselves. He accepts a part of himself that understands where these artists are coming from. He feels, rather than them shying away, they put on a front.

Kendrick is empathizing with record labels/producers/etc. saying he sees why they’re afraid to experiment with new or unique styles of music. He knows they take a risk by supporting something that isn’t as easy to sell in the charts.

Kendrick keeps making a distinction between what he’s trying to do, compared to what other rappers in the mainstream are trying to do. He’s interested in making music that’s great and sees others as trying to make music for the sake of money.

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