How do you feel about DNF’ing a book?

So I have never NOT finished a book before. Even if I don’t love it, I still usually see it out until the end. I don’t typically like the feeling of having something unfinished. That being said, I started a new book a few days ago and it’s just honestly terrible. The writing is so amateur that it’s all-consuming. I can’t concentrate on the plot because the writing is just THAT bad. And I think it might be justification to not finish…