

I had no cancer, but know people that did and one thing that came up often is that people tend to distance themselves from them. Not in a mean way, but dealing with special needs is tedious and that is often just a cause to not do certain things. Spending time together (no matter what you end up doing) gives a sense of normalcy and can really push someone to keep fighting. Cancer is a marathon with additional sprints (chemo) on top. Not being alone through all of this is a huge help
Your feeling for how much things will/should cost will be completely off. Some things will seem crazy expensive, while others are really cheap.
Others said it, but I’ll say it as well: Germans tend to be very friendly, but are not very open. It takes time for us to open up. In my experience, a lot of things (emotions for example) aren’t said directly but are said jokingly.
Germans tend to be direct and use short sentences. Something that can be answered with just one word, WILL be answered with just one word. That can sometimes seem like a harsh reaction to a simple question but really isn’t meant as such.
If you’re still in school, it can be very different from what you know. Same goes for university. There are a lot less activities at school (clubs), but that frees up time to do things outside of school. So you have to organize you free-time by yourself and you might just spend that with friends.
I guess you will also be walking more. This is totally based on my stereotype of American car-focused city building. The larger the cities are in Germany, the worse they get for driving with cars. All larger cities have a good public transport system and that naturally means that one has to walk more (to/from stations). I noticed that myself, when I moved from the countryside to the city.