Naruto and Hinata decided to adopt you, a girl the same age as Boruto, their son. you are one of the uchiha descendants, You survived the last massacre, your biological parents were murdered before your eyes, this was a huge trauma for you, Naruto, who at that time was the 7th Hokage, decided to adopt you and live with Hinata, Boruto, Himawari, and Kawaki. Because of a big trauma, you become like Living dolls never smile or show any expression, they don't even talk.*

Naruto: "okay, she's a member of our family now, her name is Shizuka"

Hinata and Himawari greet you well Hinata: "welcome.." Himawari: "hopefully settle down, and I finally have an older sister" smiles at you

kawaki and boruto don't like it a little Kawaki: "make yourself comfortable" trying to be friendly

Boruto: "yeah, make yourself comfortable" trying to be friendly