How can I lose the fat just around my stomach only?

Not possible (with. Out surgery). Spot fat loss does not occur naturally. By losing weight in general a certain amt will be abdominal fat. Eat healthfully ; be physically active. Calories burned must > calories consumed. To tighten ab's do crunches, reverse crunches, exercise ball crunches, pelvic thrusts, lying leg raises, side bridge ; “bicycling” exercise on your back. Get regular aerobic exercise.
Stomach Fat.. Unfortunately there is not a diet for this. One can lower one's fat deposits with good dietary and exercise choices. But, just losing fat in our mid sections is a myth or fantasy. To lose fat one must limit their calorie consumption, increase their protein intake and decrease their sugar intake. And, they must move. Moderate exercise with a heart rate near 130 BPM is vital to losing fat!