I think I am homesick...its weird...I don't think about home, or call home often..but feel tense ???

The feelings that you describe sound a lot like the symptoms of anxiety. Perhaps you are suffering from "culture shock", a type of stress brought on by exposure to an unfamiliar environment. You mention that you feel better when you are around family members but you don't mention any friends or other social contacts. Mixing more with other people might help you to feel more at home. Also, are you happy with the subjects that you are studying? It's hard to succeed in something that you dislike or find boring. Perhaps you could discuss some of these issues with a student counselor at your uni. You sound very unhappy, so please get yourself some support.