look. you'll never get good grades, because you don't like school. neither did i. i'd never, ever, ever go back to graduate school. getting C's and barely graduating is perfectly fine. that's a lot better than going crazy trying to excel at something you detest, and dropping out from mental anguish. (very common)

once you really understand this, it takes a tremendous burden off of your own mental state.

then, the trick is to just force yourself to do just enough work to finish with a degree, so that your money is not wasted. and doing that is not really hard. it really isn't.

your goal should be to get on with the rest of your life, not feel bad about the fact that you hate school.