My weight

I've always been the fat girl. I noticed a month or so ago that I was slowly cutting down portions. It has gotten to the point where it's almost a game to see how long I can go without eating. Many days I get less than500 calorie. I have found so much power and strength with this even though I know it's un healthy. I'm 5'7" and was 167lbs. I weighed my self today and I'm 147.3 lbs. I don't know whether I am adhamed of my self or proud. Very mixed feelings