basically i am also going to ruin the end in this

in the book there is a foster kid (male) or orphan and he runs away from the orphanage and he meets 2 natives. i remember can't talk(i think) and the other is an old man that teach him things.

and eventually i don't remember why he gets taken back to the orphanage where he kills himself in the end

but i can't remember the name any help
song stuck in my head today