Dieting

I can't seem to loose weight at all, I've tried everything from the insane diet programs where you can only eat a certain food everyday. I've tried the tinny tuck belt for my stomach, those wraps that " melt your fat away" Diet pills don't work and neither does a normal dirt and excerise I don't know what I should do I'm 5'4 and 150 pounds. I can't wear the clothes I want to wear anymore because my legs are big, (I've gotten my cellulite to go away though!!!) I need new ideas and any suggestions would be much appreciated!