Dear Susan
I’m sorry to hear that you are having trouble in adapting to your new school life in America .But this situation can be easily changed,if you take my advice .firstly you should work hard at English,which can give you morn apportunities to communicate with others . Secondly, why not make some friends ,they can help you to know more about America ,and the friendship can help you to forget loneliness . Thirdly, It would be a good idea, if you take an active part in all kinds of activethes,which will made your life more interesting by doing this , you will be happier with your new life soon.
I hope you will find these ideas useful.