I'm sort of in the same spot in terms of your physical condition. I'm 170, 5'8 and trying to convert alot of it into muscle. I'm also 16.
I know you've heard this before, but you should be eating a well balanced diet. You're young so avoid all the low calorie, low carb BS diets. Slim Fast and other mainstream diets are also big
. This doesn't mean you should just raid the refridgerator and eat whatever is in sight. In fact, this means you should be eating more wholesome products, such as plenty of vegetables, grains, and meats.
It also depends on what you want to do. Do you want to A) stay the same weight but all muscle? Or B) do you want to just lose weight? For A) you want to start taking your workout to the next level and work on the technique of each exercise and push yourself further. Do workouts for all muscles, and hit the weight room. Also put cardio in that workout as well, go for runs before/after doing weights. And Stretch AS MUCH AS YOU CAN. When it comes to eating, be sure to eat food higher in calories but also high in nutrition. For more energy, I recommend replacing lettuce with leaf spinach when making sandwiches. For B) Focus more on running. Eat less but make sure its stuff with energy and nutritional foods. Burn more than you eat, simply put. But also add in basic muscle exercises such as pushups and sit ups.
From your description, I wouldn't lose more than 20 pounds if you plan to lose weight. Make sure you get plenty of sleep, cause you're still growing.
If you're not involved in any sports at school, you should defintely do some. The more the merrier. If you don't make the team, train to make the team and it will give you motivation to work out.
Hope this helped.