You have to understand one key issue..
Muscle weighs more than fat. YOU cannot judge 'fitness' completely by a scale, because you may have a lot of muscle.
You should concentrate on exercise, which it sounds like you are trying.. With soccer.
Try some weights, extra cardio, and eat healthfully.
Dieting is never a good idea. Eating healthy for a wonderful and healthy life is key!
It keeps your priorities straight.