Be prepared for some anxiety as you discover the new rules and habits of this new place. Just remember that you left the USA to learn and to adapt, and that means losing a little bit of your American identity. Changing yourself is usually a painful process, and that is what is happening. Americans generally follow several common patterns when reacting to culture shock. Hard study, lots of reading, lots of sleep and an outpouring of letters are signs of this reaction.
Blame falls on the foreign culture, but even more on oneself.
One feels ashamed to feel homesick and miserable after having dreamt of a great experience abroad. The weather is intolerable, the prices exorbitant, the people weird. The academic program is trivial, the teachers are dull, and the students are infantile. Nothing is right. The timing of the cultural adjustment cycle varies considerably by person, by the length of time you will be abroad, and by the depth of your adjustment.