I never get homesick, and I find myself to easily adapt to any situation.
- have a plan (what are your goals, how do you want to fill your day)
- make local friends (bars, message boards, uni/dorms, sports, etc)
- realize that people are "just different" in other countries and that there is no such thing as the right way to think or do. It is all based on culture and background.
You'll be fine