Besides the constant crushing rejection, the next hardest part of writing is taking criticism. Good writers grow through it, but bad writers either bristle at it or avoid it like the paper is hot lava. It can be challenging, but you have to develop the mindset that criticism and editors are a necessary and indispensable part of developing your craft. Not only that, but the best editors charge for their services, so sometimes access to good editing is a luxury for starving artists. Joining a free workshop or group of writers is a great way to get affordable editing, but sometimes unreliable. At some point, you're going to have to shell out the money for proper editing services.
I recently found a deal on editing from Smokelong Quarterly - $20 for line editing on a flash fiction piece less than 1000 words. The feedback I got from Shasta Grant, one of the senior editors, was not only insightful, but far more extensive than I was expecting. Below, you can see the original version of my story with their edits and remarks. I found the process really helpful and effective, but you can decide for yourselves. I'm including a revised draft of the story, to show how the process works. As you can see, I didn't use every bit of advice, partly because I just didn't want to, but also partly because I felt that fixing some issues also (hopefully) fixed other problems. For instance, I'm hoping that the title becomes more impactful if I played up the denial angle.
In addition, I would be remiss, if I didn't recommend my usual editor, Adrienne Horne at IA. M Editing, Ink. She and her staff do great work at affordable rates, and I've always been happy with her advice, even when she tells me, in Christian love, that the thing is not ready for publishing yet.