Is there Such a Thing as Fiction?

I was thinking today about writing fiction. My article, Why Write, published on many writing websites, gives some good tips for aspiring novelists. But one thought occurred to me today. Maybe there is no such thing as fiction because anything that a writer's mind conceives has happened in real life. Even in the genres of Fantasy and Science Fiction, it has happened somewhere to someone or else the writer would not be able to formulate the words and ideas to express the narrative. So there is no such thing as fiction. Everything is non-fiction, even fiction.