Don't be hard on yourself when trying to lose weight. Give yourself a break. Know that sometimes you won't make it to your workout, sometimes you'll eat badly and sometimes you will want to stop. But being easy on yourself means that you forgive yourself and can continue until you lose the weight you want to lose.
A key to losing weight is to make sure you eat healthy food. Try and eat as much fruit and vegetables as you possibly can. This will help you to get all of your nutritional needs met, as well as fill you up on lower calorie foods, that are also, low in fat.