An English accent

When I was listening to this month's CNN-EE, I realized that there were articles which were pronounced with "American accent". Last month's was " English accent", (before I said though) which I'm not good at..
Cuz, I've studied English with the former as well I speak since I started ,you know I was junior high-school student. So when I listened to the later, I felt uneasy.
Still now I often feel like that, you know, even I can got some contents easily, I have to concentrate completely...but...not as much as before though.

Apparently, American english has already immersed in myself.(^^;)