Mistaken?

What a rough day at work today.

This happened more than once today...
There was a customer sitting behind me, he's one of those rude customers who enjoy causing problems. He kept yelling at the manager. Anyways, he was curious about what I was doing. I was sitting at the employee table minding my own business (I was working on the Shinjiro homage). The man asked me and I told him I was drawing. I then told him that I was taking a little break from being cashier. He got a little angry and said, "hey... shouldn't you be working? You'll get in trouble young man." I'm thinking, "WTF?! Young man?!?!?!?!" HE DID NOT JUST MISTAKE ME FOR A BOY!!!!!!!!!!!!! I didn't really say anything in response due to shock.

The manager came over because she thought I started a fight with a customer(I actually would've if the manager hadn't shown up). The man started talking to the manager, he began asking, "has this boy been giving you any trouble? He sounds like a slacker. Has he been good to you? This boy works hard right?" I'm sure the manager caught this too, because she started stressing the pronouns by saying, "SHE is a good cashier, SHE'S the best employee in the restaurant." However, when the manager say's it.... "she" sounds an awful lot like "he." The customer kept referring to me as a boy! He walked out of the restaurant with the understanding that I was a boy...

I have never felt so offended in my life.
This is something to be offended about, right?
Do I really look like a boy?!
I know my voice is really low because I hate using my high pitch voice. It probably doesn't help that I wear boy's clothes because that's the only thing my mom buys me. Why do people mistake me for a boy?! WHY?!

Worst day ever!!!!!!!!!!!!