How can I get into the real culture here?!

I've said many times that it seems everything here is the same to me as that in China. I like the food here as they are really delicious. I like the people here as they are really friendly, considerable, and helpful. I like the landscapes here as they are really stunning. I like the teaching here as they really suit me. However, when I take a close look at it, I find myself still out of the real American culture here because of the party night I spent several days ago.
I really want to play games, dance, and talk with them. But I just cannot conquer the fear in my heart. In short ,I'm afraid of losing face and being laughed at. Actually I can be as crazy as them when playing and dancing. I know I can . But there're too many "but".
Till now, I still don't have a good American friend. Maybe it is bacause I'm not good at making friends even in China. What I need to do now is to treat them like my friends and conquer the fear inside my heart. I can do it.