Have you heard of "The Valley of Shit"? You may be in it a little bit.That's ok! I attached a link describing what is. I think everyone working on their dissertation experiences this. I myself was there and it felt so incredibly lonely. I made the choice to keep going and yesterday I received final approval from committee. My dissertation went through many iterations, and I had to adapt a growth-mindset for myself to help get through. When my committee recommended changes (large and small) I considered how their advice might make my study better. Do not think you have failed when a professor gives you feedback that may change elements of your first drafts. Stand your ground where you must, but allow them to help you make your work clearer to all readers. I sincerely hope you keep going and know that after time (usually much more time than we would like) it does get better.