Computer: begin re-writing process

First of all, I'm happy that my pledge yesterday seems to work. OK, there's still only two comments (excluding my own), but it's a start, right?

Yesterday, I spent the rainy day working at home (actually, at my boyfriend's, but still...). I had printed the first 14 pages of my thesis, and the time had come to revise and re-write for the first time. And what a glorious feeling! (I'm happy as can be...) I felt like NOW, I have finally begun the real writing process - which is bollocks, I know. My writing process begun in late January.

And this isn't even the first piece of text that I've re-written. The four teaching proposals have been completed for a month now. Somehow, I feel like they don't count. Perhaps because they weren't hard to write at all?

Yesterday's piece of writing was hard to write. It was the section on other rhetoricians' view on rhetorical reading, rhetorical analysis, imitatio - call it what you will. And now the most scary bit is creeping closer:

I have to send it to my professor. It's strange:

He's there to help me.
I'm lucky to get his help, as it will - without doubt - improve my thesis.
He knows that the text is not finished yet and doesn't expect a perfect piece of writing.

So why do I feel embarrassed - perhaps even scared - to send him something more concrete than four pages of speed writing? Has anyone of you experienced the same thing? Why? And what did you do?