American way of live

Americans have their own way of live. I have noticed a couple of things, which is different than in Finland.
1. If you walk on the street, people smile to you and say "Hello or Hi, how are you?". And in Finland people don't smile or say nothing to you.
2.Drivers dodge you if you are walking across the road.
3.Americans eat everywhere. They always have snacks in their back or they buy it somewhere.
4.Americans haven't a golden mean. For example they eat very healthy or very unhealthy or they are crazy about sports and sports all time or they don't do nothing sports.
Everybody who I have met have been very friendly. I like Americans.