You are describing the process of acquiring enough skills to become able to translate a vision in your imagination into a concrete work. This tedious apprentice stage is a function of achieving mastery!
This is most evident to me in taking classes: my first real quilting class was Freddy Moran and I bless her for giving us permission to just play with the taught techniques in class without feeling we had to generate a finished work. She herself confessed to not "working well" in class, but found when she returned to her studio, the skills acquired found their way into future work.
I found it took several years of learning techniques, not all of which I liked or plan to use going forward, to get to a point where I could with some confidence "solve" any given design challenge. This has come home to me most forcefully in participating in Round Robins, where you get a quilt top in progress and must "make it better", sometimes within the limitations of a specific prompt.
I now have a suite of skills I can deploy to solve the design problem at hand...so keep at it! You won't use all the things you are learning going forward but you do take nuggets away from every class.
One of the nicest things about quilting is the many separate skill sets involved. It keeps you learning and that is good for mental health and all your little grey cells!