As OJ said, you can't spot reduce.
Try following a fairly healthy diet - Complex Carbs (60%), Proteins (30%) and Fats (5-10%. Yes, not all fats are bad for you
)
Also participate in:
a.
High
Intensity
Interval
Training: this type of exercise is tough, less time is spent actually running, but the effort needs to be
much higher. This type is also very harder.
b.
Low
Intensity
Long
Distance: same amount of fat gets burnt, but this type of exercise is much easier. It depends if you want to spend more time training or less.
A higher amount of muscle mass will help burn fats throughout the day as well. The larger the muscles, the more energy will be required to run. The energy is taken from the fat stores around the body. So I'd suggest some
light weights for now. Don't go too heavy just yet as you will want to perfect your form and technique for when you get a little older. Lifting weights with incorrect technique can lead to serious injuries.