But don’t be worried if your novel idea has similarities to other things you might have read.*
Don’t let it stop you from writing what you want to write. Don’t let any similarities stop you from doing your best.
The difference is going to be how you write it. What characters are you using, what plot twists are you going to throw in, how are you going to change up this cliche?
Make the novel yours, and it won’t matter if the idea isn’t original. It will be different, and fresh and exciting in other ways. In your way.
*Just make sure it’s not too similar though, or you’ll be hunted down and denied cake for the rest of your life.