If getting fit is your goal but just not happening maybe it's time to find a new source of inspiration/motivation. Instead of dwelling on what the scale says, how about finding something else on which to focus.
I find when I ride my bike as my main mode of transportation I keep my weight in check without much thought. And that's even with the occasional drink out, burritos and my ultimate down fall: chips and salsa. Everything in moderation, people!
So yes, I ride for those reasons, but there are two more that motivate me to keep on peddlin'. Saving money and saving the planet. Why buy gas when I can ride for free? And why burn fossil fuels when I can burn my own internal engine that could. And so can you!
...maybe you could focus on how walking to work is so much more relaxing than sitting in traffic. Or how swimming makes you feel weightless. Or when you go dancing you feel sexy and sassy. If you stop focusing on that perceived hard-to-attain weight loss goal and find enjoyable reasons to move it to lose it, maybe it won't be so hard after all.
Just a thought...Ok, gotta ride...to the library for my volunteer shift. Cheers! ;-)