Hi there,
Ideally you don't want to hate your subjects, as otherwise you'll dread and probably won't be revising them and so won't do well. It's a common idea now that discipline > motivation - if your motivation is to pursue a well-paid job, that should be enough to keep you disciplined! While it's true that people who succeed tend to be passionate about their subjects, I think as long as you have a reason to do well that is strong enough to keep you going, you'll be fine. Don't lose sight of the end goal!
Good luck!