Hope you are well. I am sorry to pry a little here, but from what you typed I get the sense your parents are not too keen on you moving to HK or perhaps even unaware of your plans. I also sense a slight air of desperation in what you typed but I am probably all wrong and being a nosey old idiot.
Hong Kong is a great city, but like every great city, it also has a darker side. It is also an extremely expensive part of the world to live and you will need to find a job that pays a decent salary or you will end up living in some less than post-card picturesque areas in an apartment smaller than your current bathroom.
Perhaps you have it all planned out, perhaps you can speak and read Cantonese, have a job lined up, a place to live, perhaps support from friends and family and lots of money to burn. But on the off chance you do not have all those matters sorted out, I would seriously plan them all out before you even check plane ticket prices.
Anyway, sorry to pry and perhaps this seems like (pissing on your fire and back-seat parenting) but yes you're an adult, but a young adult. I am close to 40 years old but I am still learning everyday.
Sorry to sound a bit negative, but I wish you all the best.