I'd have to agree with the voice thing. That makes a big difference. And honestly hon, you pass for a very young boy, say 12.
Whether his family takes you for a girl or a very young boy - either way they're going to know something's up.
Nero's just giving it to you straight.
And I understand completely, because I had the misfortune to be a pretty girl too (well, until I got swollen with fat, that is), and it's hard when there's nothing you can do with the face to make it masculine.
Sounds like you have a great guy there.