Need to loss it

I need help to loss my fat i am 89lbs and i want to loss 10-12 pounds butt i cant figer enything out iv tryed runing use to run 2 miles aday with my mom and that did not work! tryed to eat healthy and that dident work! was on a water diet for 6 months did not work! whent to the P E dident help im out of options helpp plz!!!!!!! :'(