[miming]

I've been reading quite a lot about japanese words/ gramma/ sentence construction and I think i did all i can. So I tried watching japanese cartoons to see if i can understand. and ola! not a single thinng.. oh maybe just the greetings and the most common one but not the conversations. i still have 2 months before I go to japan to work. what can i do? how can i understand japanese.. they talk so fast... my mind is so slow.... is it really hard..? or im just dumb.. btw, i already spent 2 months... help....