Depending on who you read there are two, seven or twelve basic plots and all stories fit into one of those templates. I write relationship novels. People split up, they get together, they have affairs, whatever. They're not original themes. No one reading one of my books would go 'Wow - I've never read a story like that before'. What makes one of my books original is me. No one will have ever read a story written just the way Sarah Duncan writes a story. If I'm lucky it chimes with enough people's experience to make them want to read more about my characters and see where my imagination goes.
So if I write what isn't 'me', if I pretend I'm someone else, if I try to write what I think someone else would like - whether that someone is my mother, my editor, my teacher, a literary critic - then I'm scuppered. I've got rid of the one original thing I have to offer. Me, and my take on the world. Write from the heart, write from your guts, write what you want to write. It's the only way.