Was my 1st draft really this bad?

So before you think I'm one of those delusional writers with an inflated sense of self, let me be clear: my first draft of my novel was atrocious.

In fact, it was so bad I had to cut about 20K words right off the top because I started the story two weeks before anything happened and introduced at least four characters who had no impact on the story what-so-ever.
All those truly awful unused words!

But I worked on that draft for five months and made it all shiny and pretty.

And that's the problem I'm having now while working on my new MS. With every new paragraph I can't help but think, "This is not the best I can do. I'm going to have to rewrite that." And that's hardly a motivational attitude when I'm trying to pump out words. I seem to have forgotten that the pretty, shiny MS I sent out to the scary world of agents started out as a big lump of Please Revise.

I've heard the advice everywhere that we have to give ourselves permission to write a bad first draft, but that's easier to say than do.

Somehow, I convinced myself that I would become a better writer the longer I wrote. And to be clear, I am. But I set myself up for some kind of impossible improvement. The kind where the words flow out into a nearly perfect manuscript that only needs minor tweaking during the revision process. Ha!

So, I'm working on it. Reminding myself that it's ok if I use an adverb now, write a dull sentence that gets the point across but needs to be rewritten for flow, or insert a [insert x here] when I'm not sure what to write. It's a daily struggle to resist the urge to stop writing the new and just fix what I have so far (which you know from my last post is not very much).

So what do you do? Any mental tricks for giving yourself permission to write a bad first draft?