@AlanRalph That's a very good point. I don't so much compare myself to others as an idealised version of myself - me on my absolute best days when everything flows. Overall, I think it's a feeling that there should be "more" and "better"; I'm way too hard on myself, always have been, but am slowly making changes that I hope will alleviate much of the self-criticism.
@colinwalker I used to ask myself if I was a real writer. It wasn’t a helpful question because it led only to navel gazing angst. Some unsolicited advice from a fellow writer: take the energy you spend worrying about this topic and apply it to a writing project instead. 🙂