You sound as though you are rather thin... but it shouldnt matter what other people say. Anorexic simply means that you are not hungry. Anorexia Nervosa is a disease caused by not eating. You just be you and be happy with who you are. Do not live up to any one elses expectations.
When it comes down to it your are whatever you feel you are and trust me you should feel beautiful especially when people are dissing on you that just means they're are jealous and you can't really rely on the doctors chart because I'm about 6'2 and I weigh 295 but my fat to muscle ratio on my body is 12% to 88% so I'm not fat/obese even though the charts say I am