My mother asked me to immigrate to Canada, so I'm not from China.

Immigration to Canada is actually divided into two situations:

First, take the maple leaf card in Canada, which is a kind of immigration. In this case, you actually only get permanent residency in Canada, not become a Canadian citizen. So your passport is still China passport, so your nationality is actually China nationality, and you are from China.

The second way is to join Canadian citizenship and give up China citizenship. In this case, your nationality has changed, and your passport has changed from China passport to Canadian passport. So, you are actually from China, but your nationality is not China. Generally speaking, this situation is called Canadian Chinese, which means Chinese with Canadian nationality. So, in the final analysis, even if your nationality changes, you still belong to China, just a Canadian from China.