I confuse people

Since uploading images isn't working for some reason, I'll tell you about this instead. I meet new people at a pretty constant rate here, and often we'll end up having a conversation that runs something like the following:

Random Person (RP): So, where are you from?
Me: ... The U.S. Texas actually.
RP: Oh?? But you don't sound like you're from Texas at all. I mean, you don't have an accent or anything.

My stock answer is that my parents are from New Zealand, so that I don't spend 5 minutes talking about how Austin is fairly international, not all Texans have a stereotypical Texan accent, and what have you. I know plenty of Texans without "Texas accents". But still, people seem inordinately surprised here about where I come from. I've even gotten:

RP: Oh?? But you're not... I mean, you're not big. *makes increasing girth motion with his hands*

Eh? Many question marks. I guess it's bad when all Texans are thought to be overweight.