Dylan Dryer advises:”It’s useful to remember that writing is not natural because writers tend to judge their writing processes too harshly—comparing them to the ease with which they speak (29).
Remember, you acquired language as a baby. It happened over time, you were taught, but you were also constantly exposed to it. It’s like good (such a bad word!) writers are/were good readers. Children who were read to, and read themselves, were/are exposed to words and sentences over time. And that is, in a large part, referring to writers who are good at mechanics. the most technically perfect sentence can still be ineffective.
A writer’s two best friends are time and distance. Give yourself time to write, and time to get away from it, return, and revise.
Dryer, Dylan. “Writing Is Not Natural.” Naming What We Know: Threshold Concepts of Writing Studies, edited by Linda Adler-Kassner and Elizabeth A. Wardle, Utah State University Press, 2016, pp. 27–29.