I guess the best thing for me to do is start writing. I know some novels don't start out so well, as the examples you have mentioned with authors who've written terrible books in the beginning, but my concern is my ideas might get literally banned for all the different cultural diversity mixed in, mo matter how well it's writtenI personally think it's impossible to judge a story by the idea / outline as written. Unless your whole idea, plot and premiss is racist, in which case don't write it.
But for what you wrote, keep what the others in this thread have said in mind and just write the story. All of these issues very much depend on how the story is written, on the execution, not on the idea. So write the story. When you're done, find some sensitivity readers and give it to them, ask their opinion. They will tell you what's good and bad about your story. That's the only way to deal with something like this.
Another thing, if this is your first novel (and I'm pretty sure it is), then don't worry about any of it. It will most likely be bad, since almost all first novels are. Just read some of the first stories Tolkien wrote (you can find them in the Book of Lost Tales). They're terrible to the point of being hard to finish. And that's about my favorite author. So, write your story and congratulate yourself on finishing a novel and one which is possibly better than the first stories written by Tolkien.
There is a very big chance no one will read or buy your first novel. That's also not the point of it. The point of a first novel is to practise the craft of writing. To learn your process and about finishing a story. It's not about writing a masterpiece.
So just write the novel. Get it our of your system and onto paper. Only when you're done worry about what people might say. Give it to a few people who's opinion you trust (who are not your family / close friends, unless they are professional editors / writers) and ask their opinion. Until then all worrying you're doing is pointless.
Are there any Chinese, Japanese or Ainu people on here that I can get some feedback from?