Why can't I sell my creations?

Reread your penultimate sentence.

Now read it again.

There's your answer. Because unless you're dying tomorrow (and if you are, what the hell are you doing on an internet message board?), then it's not your last chance to do anything.

You are paralyzing yourself with that kind of pressure. And it's for no good reason.

So cut that **** out yesterday.

I'm a published author. My first novel was published when I was 51.

I also wrote for a long time--- and a writer's first million or so words are generally terrible. Artists have some sort of similar threshold. Your unconscious may be realizing you need more practice.

You would probably also benefit from some education, and I say that even though you've already had plenty. Because it can help with imposter syndrome.

I would also suggest taking a college-level course (you can audit it; this isn't for a grade) in marketing to help you learn how to communicate to your potential clientele about your wares. Because I can assure you (I work in marketing) that saying your stuff isn't the worst out there is not the way to go about it.

Thanks Jespa, your answer helped, particularly the mention of the imposter syndrome.
This makes me think of a woman potter once who spent years of her life making beautiful ceramics but, just like me, could never actually bring herself to put them on sale. Her exquisitely crafted objects were never good enough for her though, she endlessly sought perfection when, in my humble opinion, from what I could see there was no need. And, as an author yourself, I guess you know there are plenty of manuscripts lying in drawers, unpublished, because their authors feel they will be rejected anyway when in fact the world could be missing on a real masterpiece. I'm sure there are millions of us out there, scared of going ahead
I take your point though about taking a course in marketing, but it has a cost I simply can't afford. I've learnt of lot still with free internet courses (MOOC type), tutorials and so on, and the marketplaces are quite helpful.
Still, I think that, even with a doctorate in marketing (does that exist? ), I would still be scared of going ahead and putting my beads on sale
(Sorry about all the emoticons, my creative side popping up).
Also, congratulations on your publishing success!

You can always start small.

Sometimes, too, people think what they produce is unworthy for public consumption. Perhaps if you considered marketing them as if someone else had made them, you'd be able to find a way forward. Don't say you made them, just say you're the seller or middleman. It may be easier that way.