I am a sinner who's probably gonna sin again
Lord forgive me, Lord forgive me things I don't understand
Sometimes I need to be alone

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

Meaning

A major theme in Kendrick’s music in general is his faith and how he reconciles it with the sinful activities that enjoys

Kendrick humbly acknowledges that he is a human who makes mistakes. The skit leading into this song is his father wanting to listen to his complaining Kendrick/his mother are “killin' [his] muthafuckin' vibe.” His dad might use drinking and listening to music as a means of escape from this life.

Others believe to sin is to doubt of god. So, because Kendrick doesn’t understand some things, he acts sinfully and doubts god.
This might be Kendrick’s prayer and confession, for the lack of understanding that misguides him.

Saying “sometimes I need to be alone” refers back to peer pressure. He knows he won´t act bad when he´s alone because deep in his mind he knows what he is doing is wrong “The Art of Peer Pressure”

Usually I’m drug free
But shit, I’m with the homies…
It’s ironic, cause I never been violent
Until I’m with the homies

To help improve the meaning of these lyrics, visit “Bitch, Don't Kill My Vibe” by Kendrick Lamar Lyrics and leave a comment on the lyrics box