Do I Have an Eating Disorder?

So I've been struggling with my weight and my body lately, and I know that I'm not "big", but it really feels like it. I'm wondering what all Ed consists of, and if I really do have an Ed. somethings I found that I do are sometimes I don't eat at all, other times I eat excessively, feeling like I can't stop. sometimes when I look at certain foods I lose my appetite and feel like gagging at the thought of me eating said food. I'm constantly comparing my body to other girls' bodies and without fail, everyone looks so much better than mine. I don't have a scale at home, but everything I'm at my friends house, I use her scale and am disgusted with that number. it physically makes me sick sometimes. I know this all started with my mother Commenting on how much I eat, how much I've been gaining, commenting on how I'm getting a little "pouch". then when others are around she loves saying how I'm so skinny and the skinniest in the family and it just makes me uncomfortable. I can go into further detail if needs be but can anyone help me how to know if I have a real Ed, and how to help it or if I don't have a real Ed and I'm just overreacting? tysm