Where I live now (NY), I know 0 male Ashleys, but when I lived in SC, it was much more common to meet males named
Ashley.
Ashlee is considered 100% girl in the US, but since you're from the UK, I think we'll make an exception. ;o) And I see that you've stated most people call you
Ash once they get to know you, so I'm not foreseeing any HUGE problems with this. Just expect teachers to look surprised when they call roll & you answer. :o) And if anyone gives you a hard time, you can always tell them than in England,
Ashley /
Ashlee is a boy's name. (No need to burden them with the truth that it's used on guys and girls, lol).