I don't see anything wrong with it, other than the fact that you didn't get enough sleep.
But you understood everything correctly - the chances of getting a response are slim. I don't know about dating sites, but Chinese people are extremely reluctant to communicate via email. Mostly they hang out in some kind of chats and video chats.
On the other hand, it will be something to remember. You'll appreciate it someday.
Знание некоторых закономерностей освобождает от изучения многих фактов.
Мечты сбываются рано или поздно, так или иначе.