Prisoner: 75194, The Promised Neverland

Hi, this is a 'The Promised Neverland X Reader' fanfiction. I don't see too many of them, so I'm going to add my own, and hopefully I'll inspire more to write some.
Your name is (Y/N), and you are 10 years old. Your number is 75194. You are best friends with Don and Gilda.
You live in 'Grace Fields'. An orphanage. None of you are related and none of you know your parents. You all know and love only one woman. 'Mama'. She has taken care of all of you since you were babies. The house was full of love, all the time. However, unlike the rest, you aren't as cheery as them, but you still loved them. As time goes on, you learn and discover disturbing secrets about your home, Mama and yourself.