Myheritage DNA test accuracy for ethnicity

So I was recently gifted a DNA test to find out my ethnicity as I have had suspicions for some time that I am not half British half Chinese but in-fact fully Chinese or some sort of Asian. My mother is Chinese and my supposed father is British but he passed in 2018, so I wanted to do a DNA test to see a rough gauge of what my ethnicity may be to see if I had good reason for these doubts. I just received the results today and they showed me as being 97% Chinese and 3% south East Asian. However all my DNA matches appear to be from Europe? I doubt the test could be this inaccurate but any advice would be appreciated as I don’t want to confront my mother unless I am more than 90% sure that he was not my father. I can’t attach photos here but I’ll try and add them in the comments if that’s possible!