These are all normal reactions to the extreme stress and confusion that comes with getting used to a foreign environment. The best thing to do in this situation is to find someone to talk to about your feelings - a friend, a roommate or floormate, one of the programme staff, or the programme counsellor. You will find out that not only are your feelings natural, but that many of the people around you are feeling the same way. Talking about your anger and frustration will help put them in perspective. Working out your stress through activity and exercise will also help you to get through this difficult period.
Culture shock is due to a number of factors.
Most people react to some of them. Your skills are useless and you begin to wonder about your own ability. In Japan, you know who you are. You are a student at Ritsumeikan, one of the better universities in Japan. You are a son or daughter, brother or sister.