I think that you should finish your degree, and then maybe take a Master's on something you like better.
I have always sucked at maths (and physics, chemistry, etc. --number thingies). Since it was not mandatory at my school, I even skipped those subjects in my last year of high school. Then I took a science degree with a great deal of maths and chemistry, especially in the first year. Many days I went home crying after a maths class, since nothing seemed to sink in. However, there was a classmate who was a genious at those subjects, and we decided to stay every afternoon at the library working on the problems, helping me when I didn't understand something (and it served as training for him).
The exams arrived eventually and, although my marks were far from brilliant, I passed without much trouble. I still don't like maths or chemistry, but at least I understood those concepts and I can now use them in my job.
Tl;dr: 4x effort and you'll be good