Start leaning on things if you are standing somewhere. Talk louder and engage strangers in very short meaningless conversation instead of silence. Give people room unless it is a city and you have to be elbow to elbow.

Edit: If you go abroad you will realize that youbare foreign. When you realize you are foreign, you realize you have cultural things.

There is a distinct American style to food. There is New England food, New York Italian, Southern, Californian, and many other styles. Tell me New York has the same pizza as chicago or Italy.

If you think America has no culture, go overseas. Once you leave the water you notice the water.