You need to eat at least 2000 calories a day. You have to eat the proper amount of the right kinds of food if you want to lose weight. If you eat less, then your metabolism will slow down. Food is fuel for your body as gas is fuel for a car.
Eat right and exercise for at least 30 minutes a day. Do NOT worry about your weight... Concern yourself with how you feel about what you look like. Concern yourself with what you look like. If you work out, you will build muscle, and muscle weighs more than fat does.... so stay off the scale.