From all the different pics you've posted in various threads, I'd say you pass anywhere from 14-16, even 17. 10 is crazy, if you told me you were 10 I wouldn't believe you. But I do think there's plenty of times people completely guess age wrong. When I was 14 I somehow passed as a college student, it was just a one off thing. Now I am usually mistaken for a 12-14 year old which sucks big time.
As someone about to go to college, I totally know what you mean. All the guys around me are growing beards and are very masculine in their voice, and it's really painful sometimes for me to be around them. I try and imagine it's like I'm just a late bloomer, and it makes me feel a little bit better about it.