How can i become skinny by the end of summer?

i want to become skinny by the end of summer, i want guys to actually look at me, and see me more then "just a friend". i wanna be able to have a new boyfriend! the last one broke up wit me because i am apparently to fat 4 him! I'M NOT THAT FRIGGIN' FAT!! eating healthy, and exercising don't work 4 me! I've tried everything, and i can't starve myself, because i'm a diabetic! so i need help, i wanna loose weight b4 summer ends, i weigh 138 pounds, and i'm only 5'3"!! I WEIGH ONE HUNDRED, THIRTY-EIGHT!! so if u have any input, then please help!! i'm begging u!! PLZ HELP ME!!