Stare at your work until you hate it

so I've been writing a little chapter for someone (with permission) to get back into writing. Seriously ADHD sucks something fierce but as I'm writing it I just shake my head and glower at my screen. I really don't like my own writing and I am insulting myself in my head over it, disliking my word usage, grammar and the structure of the story.

Is that normal? Or am I in a unique circle of hell here?