What does an american accent sound like to a foreigner?

[insomniac17]

http://www.gazette.com/articles/state-56934-colorado-denison.html
http://en.wikipedia.org/wiki/General_american (I think this is the best way to put the accent here)

I don't know what accent I have. I've tried to figure it out before, but I can't tell. The way I talk just sounds like English. I don't know how to describe it.