how do i stop struggling with lying by omission when i dont want to talk about certain things?

for example:

them: “hey how are you, and your family?”

me: “uh… we’re fine.”

and then i feel like a douche. because we’re not fine. at all. so sometimes it goes like this:

me: “my family and i are having very complicated issues but i dont really wanna talk about it”

them: “then why did you bring it up???”

the only solution is not to bring it up, but i REALLY struggle with lying. even if its for a good reason.