I'm also left footed! I can mirror write too. (Write something with my right hand, as normal and if i have a pen in my left hand, I can write the same words - backwards - going right to left - without "Thinking" about it, it just "Happens"). I don't know how or why I can do this, but I can🤷🏻‍♂️. Also, the more I've read about it and while I'm still undiagnosed, I'm almost certain that I'm ASD. Ever since I was young, I've always felt "Different", but I quite like that. "Normal", is boring!