Many colleges would let you defer admissions for a year, sometimes two.
My biggest concern would be the loss of momentum. Some math concepts seem to become a case of “use it or loose it”. Your study habits are in a groove. Some people find these difficult to get back once those skills get rusty.
There isn’t a wrong answer. A year in China could be a great opportunity. I don’t know if “it’s the future” (seems all the Chinese want to study abroad themselves), but it would be interesting and educational nonetheless.
The important thing is that it is YOUR decision. If you aren’t excited about your choice, you aren’t likely to make the most of it.