“Rape Joke” poem by Patricia Lockwood (post 2)

https://www.theawl.com/2013/07/patricia-lockwood-rape-joke/

Aug. 21 Note: First line of Lockwood’s poem “Rape Joke” is as follows: “The rape joke is that you were 19 years old.” According to Wikipedia, the poem is nonfiction, autobiographical. So will the rape be discussed in Priestdaddy, a memoir, which includes the time she was nineteen?

And why does the poem say the rape happened to “you” not “I”? Is it for purely literary reasons? Or was the poem written by another personality, her poet personality, who is speaking to and about the personality who did experience the rape?