Do i have eating disorder?

Well, you should never compare your bodies to other girls, everyone's body is different. No one's body is the same. Be comfortable in your own body, after all you are the only one living in it. Losing weight is not good. The best advice is to go to the Doctor. You need help. According to a doctor, you are right at normal weight if you loose 5 more pounds, you will still be normal weight, but if you loose anymore you will be underweight and possibly be in danger. Go get checked.