Admissions officers calibrate their review of an applicant in large part based on the school profile that a high school counselor sends.
This document varies from school to school, but includes more than just “school statistics,” but that’s a start. You may want to collect several from US schools — they are often available on the school website — and see if your counselor could put together something similar. If US colleges understand that your school’s rigor, grading system, good placement in Chinese universities (there will be an AO who covers Asia and is familiar), etc., they will have a better understanding of your academic foundation and aptitude.
Also, remember that US admissions are holistic. It sounds like you are a US citizen or dual-citizen who is living in China. You likely have some interesting stories to relay in essays. Your activities can also be impactful. In addition to a school profile that puts your transcript in context, there are many ways to shine on an application.
That’s the good news. The bad news is usually that applying from a foreign country often means you need to be among the tippy top students in your country to have success because most colleges take a small number from each country. In your case, there may be no downside if you are applying as a US/domestic student.