LZ, why are you so worried about it? Like I said before, without the proper language settings, you will have a hard time getting better at your verbal skills. Just get over here first; as long as you don't shy away from actively participating in class/group projects/daily conversations with your classmates/professors/roommates/friends/pizza delivery guys/customer service reps, you will be fluent in no time. In the mean time, all other stuff such as rooming with a foreigner back home are pretty much bullsh!t, in my honest opinion. So just chill out or something.