I knew I was trans because I was eight and became utterly fascinated with the concept of voice changers so people would think I was a girl in games.
I knew I was trans because from the age of nine, I would play games as a girl character about 80% of the time.
I knew I was trans because when I was 12 I'd go to sleep praying that I'd have a dream where I just got to live as a girl. I knew I was trans because I wanted to grow up like my cousin did not like a boy. I knew I was trans because I constantly wished some extreme accident would