If you wait to feel motivated before you start, or if you stop every time you feel unmotivated, you'll never get there! What you need is PLANNING and ROUTINE. Plan like you're going to be healthy today, don't wait and see whether you feel like it.
When I'm not seeing the results I want on the scale, I depend on the points I get to make me feel like I've accomplished something! Maybe I didn't lose a pound, but by trying to get as many points as possible I know I'm doing something right. Plus, trophies!