Study hard, or work hard. You are too tired to think about it. Go back to China if you can, but it will be very painful every time you go back to China. But when I return home, I will be happy. Maybe it will get better after a while. If you find it difficult to get along with local people, find a Chinese circle as soon as possible. China has a large population. No matter what country, there will always be a Chinese community. You can find something to do at home if you don't want to go out. I am a lonely person like you, so I borrowed books from the library. When I came back, there were many people from China, so there were many Chinese books in the library. Or watch movies online. If possible, you can find some recipes online to learn how to cook. I have few friends outside now, but my life is quite full. When my life is full, I won't feel lonely and homesick.