Based on having worked for 30-plus years in business Writing for My Supper,  six years researching and writing a trilogy of top-selling novels,  followed by a decade-long doctoral degree study of the 'unconscious', 'creativity' and the 'physics of writing',  I am convinced you unconsciously know how to write.  And I believe you are capable of writing far better than what you may think or may have been told otherwise by 'misguided' and 'misinformed' instructors. 
What is the natural 'cure' for this man-made nightmare? Throw away your composition text books and go organic:
Physics of Writing...Dream-Writing...Chaos to Creativity
Physics of Writing Inc.
Copyright 2009-2019 Donald K. Beman
Welcome Aboard My Starship Wordsmith
 "Sing For Your Supper." In The Boys from Syracuse. (1938). Lorenz Hart (writer) and Richard Rogers (composer).
 Beman, D. K. "Preview: Three Book 'Grand Slam' ... Over 50,000 Copies Sold." (https://bit.ly/2GjYQKO).
 Beman, D. K. "Chaos to Creativity: The Physics of Writing." In Interdisciplinary Study of Creativity and Writing. (USCO TXu 1-655-482). (2009).  Beman, D. K. "§1.00 Introduction to the Physics of Writing." In Physics of Writing 3rd Edition (pp 19-44). (2018).
 Adler, M. J. (n.d.). "Teaching, Learning, and Their Counterfeits." In The Great Ideas Online. Center for the Study of the Great Ideas. M. Weismann, Editor. [https://bit.ly/2E9OpXg]