It sounds like you have a bit of a dilemma!
Your parents are paying for your education so you feel obliged to take the subjects they want you to take.
Have you thought about what you are really interested in?
You should start with figuring out what subjects you would enjoy. Then maybe you should approach your parents and let them know how you feel.
When you make choices based on what other people want, you are not being true to yourself and will probably be unhappy with what you are doing.
Oh, and you do need friends. Maybe this forum will provide that for you if you don't have time for anything else.
Good luck Yuan!