Insecure Writers: When to type "The End"

I should start another support group for writers like me, who can't stop revising. I go through multiple revisions before sending work to crit partners, and afterward, at least another two or three rounds. But I never feel like a story's completely finished. Even after subbing it, I can't help revising again.

I have so many other projects I want to work on, but constant revisions slow me down.

I actually just pulled a sub - one I was invited to submit - because the story didn't feel complete, and the sub call limited the word count to 15k. In the end, I don't think I'll regret it, though I had the feeling it was a slam dunk. *sigh*

Does anyone else have this problem? Or am I taking perfectionism too far?

Thanks to Alex J. Cavanaugh for launching the Insecure Writers Support Group! Hop on over to the other authors' posts. It's wonderful to lend support to fellow authors.