Your characters are always your children. And while you are writing, you're keeping them safe. Now they're ready to go into the world and it's sad. I'm happy with the way the novel came out but all the characters' ending really saddened me.
Yiyun LiOne easy mistake to make with the first novel is to expand the short story. Some things are better as a story; you cannot dilute things into a novel. I think the first hundred pages of a novel are very important. That's where you set things up: the world, the characters. Once you've set that up, it'll be much easier.
Yiyun Li