I love the show. I think it's very funny. I think it's well acted and well written and I watch it again and again. But please, please do not think that they're typical Americans.
They were not even typical New Yorkers.
The 6 characters in Friends belonged to a very, very specific sub-group of Americans. Most Americans have very different backgrounds, activities, and lives than the Friends characters. Enjoy the show. But know that it isn't what an average American is like.