Originally Answered: I feel lost now!I want to study in USA university,but first my family are lacking of finance ability to let me study abroad?
Your mother is absolutely right in that the USA is the most expensive place in the world for university studies. If you have no money, you need to look elsewhere. (Otherwise it's like saying "I want to buy a car, I have no money, but I want a Ferrari" - makes no sense; start with a Kia instead, then!) And no, you won't be getting any loans or other funding from the USA, you need to enquire with your home country's government in case they provide funding for studying abroad (I doubt it, but worth asking).
As for whether your parents 'let' you study abroad, that's a bit trickier. If money was no problem, I would say that you're presumably an adult (or at least soon will be), it's your life, you can and must do what you think is right. But of course, if you don't have the funding in place and you're at all relying on your parents to bankroll you, then you obviously need to take their views into account - after all, you can't expect to go against their wishes, yet ask them to pay for it.
Considering the money issue and your parents' resistance, I think you probably need to look closer to home. You could always go to the USA for your postgrad studies?