Second-guessing Central

I can’t be the only one who second-guesses when writing a novel. I feel like this would be very common with first-time writers but this is getting ridiculous. Just the other day, I felt so unmotivated on writing my novel, I decided it would be easier to write an anthology series about random characters based in my world, maybe 100 years or so before the events of my novel. I thought this would be a good but safe way to test whether my world works and the magic system as well as writing about life from a character from each kingdom’s perspective so I, myself can gain a better understanding of my own world. But…