Average shoe size for 10 year old boy?

I am a 10 year old girl and I wear a size 7 i guess in women shoes. But to make it more complicated,my shoes are a different sizes.So in some of my shoes I'm a 5.So I say a 10 year old girl wears a 5 or 7, depending on her height because I'm 5 feet tall.I guess I'm saying shoes run in different sizes depending on height.