Accent

So, I'm starting to notice that I have developed an Argentine accent. Like how I say some letters differently from how I was taught. For example "my name is/I'm called" is "mi llamo" and I was taught that the double L's are said like a Y's. But now I say the double L's like SH, and saying it the other way just sounds wrong to me now. Also "may" is "mayo" and I was taught to say it like "my-yo" but I say it like "my-sho" and saying it the other way feels wrong too.