If you've reached a plateau in your weight loss, try something new. Shake up your routine a little bit. Take on a new workout routine, or experiment with different sports and activities. Don't take the lack of weight loss to heart; sometimes everyone gets stuck at a certain level. The important thing is to keep going.
Since people with weight problems have been rewarding themselves with food for so long, when you do reach your weight-loss goal, you need to reward yourself with something that isn't food. You will need to learn, over time, how to reward yourself in non-food-related ways. For example, if you lose 10 pounds of your 30-pound goal, you can tell yourself you'll go to the movies with your friend (and skip the popcorn).
Some people find that once they lower their carbohydrate intake, they start to lose weight. Carbs really do nothing good for your body, are filled with a lot of processed ingredients, and can be addicting. The more carbs you eat, the more carbs your body needs, and the more weight you put on.