Meg,
I want to thank you for this encouragement. Writers take heart, because I too, have been where you are now. I was once my own worse critic, but I have learned over the years to keep trying when I fail and if an idea doesn’t work, simply back up and punt. What I mean is that you must step away from the idea that didn’t work and look at it from a different angle. When you do that, you might find a better story waiting to be written.
As another blind author, I am familiar with failure and the resistance to the notion that it might be my “fault.” I’ve had so much experience with it over my almost 69 years (with regard to writing and many other aspects of life), that I am well aware of its blessings.