Ma'am?

I've been noticing something interesting lately. And I'm trying to figure out how to take this....... But uh....and I'm trying to figure out how to say this. But here's the scenario: I go through the drive-thru at Hardees and the little lady at the window tells me how much my #1 Combo is. I hand her my card and she returns it. I ask her some odd question and she says "Yes, Ma'am." Then I ask her another question and it's "Yes, Ma'am." That happened today. Well, I've noticed that ALOT of times people are replying "Yes, Ma'am, No Ma'am." To me. My new status in life. It's now ma'am. Hey, don't get me wrong. I say Yes, Ma'am and No Ma'am, but for some reason it seems different when people say that to me. Just don't seem quiiitte right! I think about saying, "You don't have to call me Ma'am. I'm not that much older than you." Really, I'm not. I want to tell them I haven't been out of highschool that long. Oh maybe......uh........17 yrs.....hmmm. But I just got out of college......ummmm.......13 yrs ago. And it hasn't been that long since I got my first "professional" job. Um.....14 yrs ago? Uh-oh.......... And I'm still there...............at the same place....... Oh, well. I just shot my own explanation. Yes, ma'am, I did.........................