A sign of becoming more like a Taiwanese?

When I first came to Taiwan, something that most Taiwanese would say to me when they found out I'm from the States; it is "so, now you come back". My response would be: "No, I'm not from Taiwan, never been to Taiwan before, this is my first time". However, recently, I found myself saying: "So, after I came back..." Weird, why did I say? Was it because I'm tired of explaining where I'm from? Was it because there's a desire that I wanted become like one of them? or was it because I'm beginning to see myself as a Taiwanese?