I think appearance wise you pass fine, you look young and you might have people saying so, but i don't think they would question if you was male. I would say voice. I don't know what you sound like, but it's something to consider. In terms of the jeans, it depends where in the world you are from and what's the fashion trend for male students at the time. I used to wear skinny jeans all the time, a lot of guys still do and it was all you could see mostly when walking around Top man lol.