I think most of us have experienced this. I consider myself an above-average writer and I absolutely hate everything I write.
But the problem, for me anyway, is that it's exceedingly difficult to know what to work on next in order to improve. In that regard writing is entirely unlike a lot of sports.
My throws are bad? Better throw 100 passes a day, every day, until my muscle memory is there. I'm getting beat deep? Better work on my fitness. Maybe I'll never get to where I want to be, but at least I know why.
But improving one's writing is seemingly impenetrable, to me. I read what I write and it sucks but I have zero intuition about how to un-suck it. I fucking wish I could write like Heller, or Didion, or Tolkien. Not even in terms of writing novels but just the quality of their prose.