I don't think your experience is unique - I think because the U.S. has been so dominant economically, culturally, and certainly militarily, much of the world overlooks us. It's not in our national character to be boastful, we just get things done - but never mistake our quiet nature for meekness. We're fiercely proud of our country and our accomplishments - and of being very unlike our neighbors to the south.
You should definitely come visit if you get the chance, there's a lot to see, and a nation of friendly people to help you enjoy it. Ciao!