It is a normal experience and nearly everyone goes through it. Be assured that you will not be alone in this experience. Daily tasks that were simple in your home country will seem much more difficult in the United States. The food in the United States will be quite different from what you are used to eating in your home country. Although there are several restaurants that serve ethnic food, the food probably won't taste as good as the food back home.
Many students feel that people in the United States are very aggressive.
They cannot understand why people in the United States are so rude. However, these are only cultural differences and what you see in the movies is rarely the way things are in reality. Personal body space can cause trouble for people from foreign countries. People in the United States usually keep a distance of about a half a meter when talking to each other. This may seem too close or too far away depending on the country you are from.