Reddit reviews Living and Working in Germany: A Survival Handbook (Living & Working in Germany)

Yes. That's the burden of moving into another culture. Ideally you should get some help from your advisor with it, but you are still the one who needs to do the bulk of the adjustment.

FWIW, it'll come in very handy later in your career, when you can put 'culturally aware' on your resume as a skill. But you are the one in their environment, and you can't expect them all to conform to your expectations. They are probably already making allowances that you aren't aware of.

Your advisor may have been giving you subtle behavioral clues that you've missed. Try talking with him about cultural differences; he may be able to give you more guidance to how things are done there, and can certainly give you a better handle on his expectations. But you need to be more aware that cultural differences are getting in your way. You seem to feel entitled to being accommodated; that's another very American trait, and not a good one. The stereotype of the Ugly American came from reality, just like many other stereotypes. We are not that special that the rest of the world should be accommodating us.

I've run into this many times in different countries. You'd be surprised at how many people think Americans are overly friendly, effusive, and loud. We call everyone by their first name and we generally aren't shy about our opinions, whether it's about politics, religion, money and finances, people's working styles, or lifestyles. And we're very casual in our dress and mannerisms. It can really rub people in other cultures the wrong way. Try observing more closely how they treat each other, and find ways to live with it.

And you will always be a guest in their country, at least until you become a citizen. Act like it, be more respectful, and play by their rules. When in Rome...

Edit: Here are some books(and this one)that may help with the transition. And please realize--this situation is by and large not a function of you personally, it's a cultural clash. Right now it may seem like they're rejecting you as a person, but they really aren't--they are put off by your americanisms. Try not to be hurt by that. It can feel very personal, but it's really not. Once you understand the culture better and how to function within it, you'll be fine. Meanwhile, finding friends in the international student groups and other interest groups would probably be a good idea.