Welcome Haley!
There is a teen forum here if you would like to meet other teens trying to lose weight.
Have you spoken to your doctor about wanting to lose weight? If you have not then I suggest you do before you start any diet- they would be able to tell you what weight range you should be for your age and height and also be able to give you advice on what kind of plan to follow and how to get started.
Good luck with your weight loss journey.