Personally, I think it's helpful to feel disappointment and insufficiency when those emotions pop up. They are the voices of certain preferences, needs, and/or desires that work to enrich our lives. Recontextualizing the world into some kind of positive success story can often gaslight those emotions out of existence, which can, paradoxically, be self-sabotoging.

The piece reads to me like a direct and honest confrontation with failure. It means the author thinks they can do better and is working to identify unhelpful subconscious patterns and overcome them.

Personally, I found the author's laser focus on "data science projects" intriguing. I have a tendency to immediately go meta which biases towards eliding detail; however, even if overly narrow, the author's focus does end up precipitating out concrete, actionable hypotheses for improvement.

Bravo, IMHO.