Working full-time and writing at night and on weekends is a real struggle. The near constant rejection of the last six years is discouraging. Almost every time. Then I get over it and get to work. Every time, but usually after chapter three.
All writers do.
It's very human to doubt yourself. Nearly every day. All the time. No, never felt like I couldn't, but have felt like I didn't want to a lot. I'm not kidding.