Ever since I was 13 I learned how to sew and sewed shut my own bootyhole
Cause I ain't took no shit since I looked down to my nuts and saw my first pubic grow

from Bad Meets Evil (Ft. Liz Rodriguez) – Echo Lyrics on Rap Genius

Meaning

Em is saying here that he ever since he reached 13 he started to act like a man; he didn’t take no shit from anyone and proved his ability to stand his ground.

He wouldn’t even take shit from himself literally and figuratively since he shut his asshole. Also 13 is typically the age puberty begins to change the body

Also in a lot of songs he talks about changing from 12 to 13, he does it in “My Name Is”, “I’m Back”, and “Music Box

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