I (sometimes) have hypergraphia as well, and can do the same thing. That said, for me, it's never very good, and tends to require a lot of editing. Like, hypergraphia for me is great in that it gets the stuff on the page...but not so great in that I often need to edit it a *lot* before it's presentable. I'm envious that it works so well for you!

I think we all get a bit insecure at times. But I have found as I write that I slowly get better at going "OK, this is me being insecure" vs. "this is me being self-aware". (If that makes sense...) At least I think I am. I'm probably wrong half the time, which is why I love my betas!