The Agony and the Ecstasy of NaNoWriMo

I haven't written a word for NaNoWriMo for two days. Wednesday morning I wrote 1200+ words in a 90mwc and I knew what I would write next. I was less than 100 words from that 10k Badge and I wanted it. I could have made it that night. 

However, I needed to apply for a position. I decided I hated my resume and I needed to start from almost scratch. I hate talking about myself. I hate tooting my own horn, putting myself out there. Whatever saying applies to me saying good things about myself, I hate doing.

My therapist suggested I try writing my new resume in third person. My therapist is awesome. It worked. I made statements - true statements - about my experience that I never would have said if I'd been using the pronoun "I". 

I write almost exclusively in 1st POV. There's no story that I've written in 3rd POV that isn't immediately cured of all its ails by my changing it to 1st. Why? What's underneath? How does this affect my writing?