3/ I have it BAD. In everything I do, at all times, I assume I'm doing it wrong. I didn't go to art school, it just wasn't an option for me. I had to dig my way out of my small town and working in tech was how I did that. College was my vehicle into that world.
I enjoy programming, I enjoy sysadmin work, I like working with computers. And I've been doing that since middle school. And even as I got jobs and did well in them, at no point did I feel like I belonged with my peers. And this ATE at my career.
Doubt meant that I came across as incompetent until I had a way to prove otherwise.