over-repeated

It gets me exceptionally frustrated when I have to repeat the answers to these following questions in office ALL THE TIME:

"How old are you? (23) Oh...you look very young hor?"
To which I always have the urge to answer: "Yah la, of course la. Younger than You.You 100 years old Oak Tree!"

"Are you an intern? (no. I'm full timer) Oh...because you look very young la..haha"
What you mean? You mean I look damn unprofessional is it??

Trust me. This simply gets on my nerves. Seriously. And especially when things have not been going too well on you, you'll feel angsty and you just have this urge to twist off the other party's neck or bite off his/her head, if he repeats the same set of questions. I mean yeah maybe it's a compliment, at least I look youthful and bubbly and cutesy n etc to these people. But, I'm just not happy at these "compliments", because I really think it kinda means I don't look professional to you, that I'm not serious about my work? But that's totally untrue, because I am serious about everything that I do, I want to do a good job out of everything, and not having people think that this is all child's play. It's especially unfair when you just get judged by your exterior appearance, being denied the chance to be given an equal platform to perform and to be judged. In fact, this gets me so upset that I almost wanted to break down quite a couple of times, in the toilet...at my seat..damnit, but I just can't cry. Because that would only prove that they're so damn right about me. But what to do, I guess I'd just have to keep my cool about all these comments. Whatever.................