You, son of a bitch and I wish you never existed
And I swear I'd blow your brains out if you pay me a visit
But that's not realistic,

from Kendrick Lamar – I Hate You Lyrics on Rap Genius

Meaning

Kendrick is furious with Death for ending the lives of his loved ones.

Ironically he would shoot himself if Death ever visited him when that’s exactly what he wants.

It’s not realistic because:

To help improve the meaning of these lyrics, visit “I Hate You” by Kendrick Lamar Lyrics and leave a comment on the lyrics box