64 kg is 140.8 pounds and depending on your height, you may not be overweight. Also, it seems that you exercise quite a bit, therefore, you should have a fair amount of muscle, which is good. In addition, at 15, you aren't fully developed yet, so you may still grow taller, which will slim you down. Be very careful not to lose too much weight.
Limit the amount of fruit you eat, to no more than 3 servings/day, because fruit tends to have a lot of sugar, even if it is "natural".