My pelvic area is fat. is there any way i can make it less thick?

Yes , if you want: By work out &exercises , or consult cosmetic plastic surgeon , by lipo -suction or reconstructive procedures, .

Diet & exercise: With pelvic fat, you are probably overweight in other places too. To help this, you need both a healthy diet and regular exercise. There is no way to spot-reduce, except for surgery. You could work with your own doctor towards a personal program; s/he might also want you to work with a nutritionist and trainer. Good luck!