Well keep in mind that you are only a teenager and that you're still growing and getting taller, so you may still gain weight even if you decide to work out and diet a lot. You shouldn't rely on just your weight to determine how fit and healthy you are - you need to take into account your height as well. That's why BMI (body mass index) is such a better indicator of general, overall health. An even better indicator of overall health is body fat percentage. However, computing your body fat percentage is a bit trickier and takes a little longer, and this is why most people prefer using BMI instead. So I would focus on your BMI score instead of your weight (look up BMI on google, you should be able to learn a lot more from the internet).
As far as what you need to do to lose weight, there are two important things you need to do - change your diet and exercise. Stay away from foods that are high in saturated fat, trans fat, and cholesterol. Aim for foods high in dietary fiber, protein, and unsaturated fat. Also, dietitians have recently learned that consuming refined carbohydrates (e.g. potato chips) can be addictive. As far as exercise, try to do it at least three days a week (but if you can work out every day that's even better), every week. On the days that you work out, exercise for at least 30 minutes. Try to do both cardio and strength training. Strength training is important because it helps increase your metabolism.
Hope this helps!
I have a Bachelor's Degree in Health Science.