Oral training exam is over!

  Yesterday,I took the oral test for five minutes in front of Teresa. I always get nervous when I speak to foreigner.I was the second one from the last.By the time I came in ,I originally considered there would be silent and heavy mood in the room, while it was't! Teresa said to me, "hey, how are you?" in a good mood.I replied her and then got rid of anxiousness and started to talk to her.During the test, she laughed so many times,seeming to think of my comment funny.And that was truly what she thought.I got a grade that I felt satisfied with it, and I chattered about my feelings and my problems in speaking by the way, and also got the answers back.I thought that it was a good experience for me to have, and I hoped that I could have more in the future.
  In fact,there is a worry that has annoyed me for a month.I can't be along with my roommates very well.Two of them seldom talks to me ,and even one of the two sometimes puts a bad face to me .They don't tell me why and just see me as an air! Sometimes, I try my best to show care on her,but she just ignorces my existence.Also, she is the  first person  I met in DFLL.I really don't know what I can do to break the ice, can u give me some advice? Thanks :)