Emily,
I understand that you believe you are struggling with anorexia and don't feel comfortable telling anyone about it. Based on the behavior you described, you may be suffering from anorexia. There are a number of criteria used in diagnosing anorexia, including refusal to maintain a minimally normal body weight, being intensely afraid of gaining weight, and exhibiting a significant disturbance in the perception of the size or shape of your body. In addition, women with anorexia who have already gotten their period stop getting it for at least 3 consecutive months. Whether or not you qualify for a diagnosis, your eating habits sound dangerous. I would encourage you to tell your doctor or seek out a therapist who can provide you with treatment confidentially. I understand that you are worried about disappointing your family, but you may want to try telling one person because it is likely they will want to help you. Given that eating disorders tend to be harder to treat the longer they go on, you may want to seek help immediately.