huh?

I keep making mistakes: not signing papers that I need to sign (so that authorities won't give my name and address to just anyone who asks), answering questions on the phone before realizing that it's just somebody trying to sell something, opening the door for people who want me to sign a subscription, taking the wrong papers to the doctor, not punching my train ticket BEFORE getting on the train, still taking ages to look for the right coins, getting up in the restaurant to pay at the door, stopping at the zebra crossing instead of just going but crossing when I'm supposed to stop, asking stupid questions...

The problem is that since I look and speak perfectly German, people tend to be bewildered if not irritated. And I guess the explanation "Sorry, I've only been in Germany for three weeks, and it's all still very confusing" doesn't really help either.