There are probably a number of indulgences you allow yourself such as chocolate or fast food. Instead of allowing yourself to have these whenever you like try to only eat these one day of the week. This way you still get to enjoy yourself but only as a reward. This motivation works well for most people. You should also work at your fitness levels and try some cardiovascular work to shed some pounds. Many people suggest long sessions of jogging and walking but you will have the most impact with a short and intense workout.