Earlier quoted context omitted.
People tend to overvalue ideas. I see this all the time in writing where people are worried someone will steal their great idea for a story. The truth of the matter is that it’s unlikely that you’ve come up with something truly new and in any event, ideas tend to breed and multiply. I will never write all the stories and novels that I have jotted down in my notebook before I die and there are more every day.
On that note though, is there a way to protect your story if you want to pitch it to a publisher, or anywhere else ? Like a registry for story ideas ?
There's no IP protection for ideas for stories. Regardless, almost no fiction shop is going to agree to print a book on spec, just off a story pitch. Write the book first. Then you already have protection, in the form of copyright (which is automatic and doesn't require registration).