i had the same feeling when i decided to move here from the U.S. I am chinese like you, I went to school in north america for many years as well.
i felt more and more depressing as the date of my move gets closer and closer. i talked to my friends, one of my friends said "you are only one plane ticket away from America. you go there, you don't like it. YOu can always come back."
i instantly felt relieved. because the worst scenario is i don't like it and i have to buy and plane ticket and move back to the U.S.
i moved here last week, it is mixed feeling. i have a lot of adjustments to make. i am not sure if this was a good or bad move but when it comes to meeting people, i can ensure you meeting people is not hard in hk.because there are tons of expats. i have made a few friends already.