Is this a normal feeling?

I feel happy and powerful when I stay without eating for a long period of time. I feel like it means that I have self-control. I'm 5''5 and around 131 lbs. I want to get down to 115 lbs. I like to engage in hardwork without eating and I love it. When school starts again next week, I would try to do a lot of walking. I also like to clean because it helps workout my upper body.