My Girlfriend treats Me Like an authority Figure does anyone else find this strange?

[TheManFromHyrule]

My Girlfriend is a very sweet Girl Don't get me wrong I love her, But i just find it a little odd that she treats me like an authority figure. Whenever I ask her to do something She always says things in a strange way like lets say if I asked her if she took out the garbage simply for the sake of wondering if she did just so I know weather or not I have to and her answer will be something usually like "Yes Sir!" Or "yes sir...I was a good girl". Or sometimes She'll ask me Questions like "Honey if I'm a good girl can I go watch TV later?", and thing of that nature. So I was just wondering if anyone thinks this is strange as we are both 19. I Don't Know if she's just really submissive or if it's in my imagination. I think its kinda cute but still it strikes me a bit strange and I was Wondering if anyone else felt the same or had any comments?