- Not completing my Bachelor's, even if it wasn't a field remotely useful for computer science - Not going in for professional help with my depression. I thoug

- Not completing my Bachelor's, even if it wasn't a field remotely useful for computer science - Not going in for professional help with my depression. I thought I could fix it myself, that I should be able to fix it myself, and thus I prolonged it by years. By the time a dear friend sensibly convinced me to go, I thought I had fixed it, but I had constant nightmares, couldn't sleep longer than a few minutes, and had thoroughly misdiagnosed the cause of my depression that would have guaranteed its lifelong power over me. And then after therapy, after I got well, and fell again. And I didn't go. I regret not seeking help.