HELP ME LOSE WEIGHT PLEASE?

SORRY FOR USING CAPITOL LETTERS BUT I AM REALLY SERIOUS ABOUT THIS I GOT A BEAUTIFUL DRESS TODAY I MEAN IT IS SO BEATIFUL I STARTED TO CRY I TRIED IT ON AND GUESS WHAT I CANT WEAR IT SO CAN YOU PLEASE HELP ME LOSE ATLEAST 20 BY NOVEMBER19 THAT LIKE AMONTHE AND SOME DAY AWAY FROM NOW SO PLEASE HELP ANYTHING EXCEPT DIET SITES AND PLEASE SOMETHING THAT WORKS I BEEN ON EVERY DIET THERE IS TRUST ME THEY DONT WORK PLEASE THANKYOU?????