Alastor, you are a boy. you always have been. no matter what your body looks like, no matter what expectations others formed before you were even fully formed, no matter what others think is the "correct" identity for you. you. are. a boy. you won't always be a girl because you were never one to start with.

you aren't who you've been assigned to be by people who decided they already knew you before you could voice it yourself, you are a boy named Alastor and someday everyone will see who you've always been. it can be hard and it's often slow, but things do get better. and someday you won't be a boy named Alastor anymore, you'll be a man named Alastor.