Tb when people say "culture shock" they aren't talking about being surprised or apalled by a new culture but rather the medical term "shock" which is a feeling od disorientation, stress, depression, anxiety, etc that generally occurs when you immerse yourself in a new culture. No matter how much you read about a place it will never prepare you for those first few weeks of finding yourself surrounded by a new language, new food, new behaviours and norms. It can be very overwhelming.