There’s only one way to find out whether anyone thinks your work is publishable. Send it to a publisher! That story hidden away on your computer or buried under a pile of papers won’t get anywhere if it stays there unseen.
While different publishers might have different standards you can guarantee they will want the best. If your work isn’t quite up to scratch (and sometimes you have to accept it might not be) they will tell you. You are unlikely to get feedback for your submission but you can never tell. That will be up to the individual publisher.
For a publisher it’s about sales; they want good work that is likely to sell. And selling is what you will want your work to do as well. You do want people to read your story, don’t you?
Of course you can always self-publish but how do you know it’s good enough to put out there in the public domain?