I am 14 Years old and need to lose up to 100 Pounds?

MY SISTERS IS THE SAME WAY BUT SHE GUESS LIKES BEING FAT, BUT DONT RUSH IT GIRL CUZ IF YOU DO THAN YOUR DIET WILL FAIL, FATS NOT JUST GONNA COME OFF IN 1 MONTH. IT TAKES TIME. DON'T DO TO MUCH BECAUSE YOU WILL OVER DO YOURSELF AND MAKE YOU WANT TO QUIT. JUST STOP EATING FAST FOOD, AND EATING TO MUCH LIKE SODAS CHIPS AND THINGS LIKE THAT. IF YOU CHANGE YOUR DIET THAN YOU WILL LOSE WEIGHT. WALK A LIL EACH DAY I KNOW YOU HATE WALKING BUT HEY YOU HAVE TO DO, MY SISTERS THE SAME WEIGHT AND HEIGHT AS YOU. AND DON'T STAY ON THE COMPUTER OR TV TO LONG BECAUSE THAN YOU FIND YOURSELF EATING MORE....DON'T TRY TO STAVE YOURSELF CUZ IT DON'T WORK. THE HELL WITH THOSE SKINNY GIRLS///