Forget about your boss, focus on your job

First, it is ok to make some mistakes in first few months. Correct mistake and learn from it.
2nd, instead of try to figure your boss out, focus on figure your task out.
3rd, if you feel that you are not qualified for the job yet, learn harder. Start to study when you get home.

First few months are always difficult especially when you are on a job you might not entirely qualified. The only solution is to study and work harder. After you really tried, if you still cannot do the work, find something else.