I need to lose weight fast.

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  Welcome to Fun Advice!

  You should probably weigh between 117 and 148 pounds, so you are okay weight wise. I used the Adult weight chart because the Teen chart doesn’t allow for YOUR height.   Normal Adult Height-Weight Range Table

http://www.recipehound.com/weight.html

  You have a BMI of 20.98, so you are good there too.

BMI is between 18.5 and 24.9 (Normal Weight)

People whose BMI is within 18.5 to 24.9 possess the ideal amount of body weight, associated with living longest, the lowest incidence of serious ilness, as well as being perceived as more physically attractive people than persons with BMI in higher or lower ranges. However, it may be a good idea to check your Waist Circumference and keep it within the recommended limits.   bmi calculator:

http://www.bmi-calculator.net/

  What you may want to do is start a good exercise program and get your muscles toned. It won’t make you lose any weight but will replace fat with muscle which will make you feel a lot better and be more satisfied with how you look.