Hey, I just like biking and the exercise and it is like some of the commute is exercise time for free. Endorphins help a lot
But if you want to loose weight, just biking won't do it. You have to eat healthier too. If you do you will loose lbs much faster, and this is a good motivation. I find If I cycle I want to eat less and better. It isn't just that I don't want to eat back the calories I burned cycling, but I just physically am not as hungry.
Good luck and keep plugging at it.