Maybe you could try just giving up sugar before you try going completely primal. If you regularly drink soda and eat candy, then you're probably in the category where Mark recommends you reduce carbs slowly rather than trying to go completely primal all at once. It could be that once you stop flooding your tastebuds with refined sugar, you'll find more things taste good.
Personally, my biggest challenge was the fact that one of my bosses keeps a constant supply of cookies in the coffee room (right next to my lab), so I could always grab a handful of cookies when I felt hungry/bored/frustrated/social. And my mom is not only not primal (or healthy) and doesn't understand it, but she seems personally insulted whenever any of her daughters try to improve their diets, so she refuses to stop enabling and pushing processed food on me. As little relationship as I've had with my father, at least he understands that "I eat meat and vegetables" means that he should make steak, chicken, and roasted vegetables for dinner, not steak, broccoli, and mac-and-cheese! I mean, my grandma was freaking out at Easter because my mom told her I "don't eat anything." Was she ever relieved when I told her I'd eat pretty much everything she serves except the crescent rolls and dessert. "Grandma, it's not like I'm a vegetarian!"
Sorry to turn this into a personal rant -- but it is possible to go primal in the face of enablers and low motivation. The trick is to take small steps. Have you seen the PaNu "Getting Started" list? He breaks paleo down into 12 steps that you can progress through, instead of doing it all at once.