I'm skinny everywhere except my stomach?

All of my fat goes to my stomach, and it's torture. I'm super skinny everywhere else. Whenever I do sit-ups it hurts my back because I have scoliosis. I look like i'm 3 months pregnant, and my friend's boyfriend thought I was actually pregnant (and I'm definitely not lol). How do I get rid of my stomach fat? I'm worried that dieting will make me look anorexic everywhere else on my body.