Are you sure you hate maths, or just certain topics? Some are actually really annoying until you finally get the eureka moment. A Level maths teaches slightly different stuff, so if you are worried about it not being practical or being too boring, you may be surprised.
What about for AS level instead?
I'm in the same boat as you, but I chose maths for AS because of it's potential and compatibility with my science subject choices, plus I only have to do it for one year