Im on the verge of an eating disorder?

i have ALWAYS been insecure about my weight. Im 5.6 and 120 pounds, ive been worried about my weight since i was 110 pounds and would do anything to be that size again. Ive starved myself, made myself thrown up, taken pills, and done excessive exercising, my weight is always on my mind. Lately ive become a lot more comfortable with myself, and have tried to raise my self esteem and make myself feel better about the way i look, and its been working i started to not think i was fat anymore, and i stopped all my bad eating habits and everything. But everytime i argue with my sister or brother, to get at me because they know its the thing that would affect me the most, they will comment on my weight, saying nice stomach fatty, or lose some weight you discust me. My sister has a very low metabolism so shes always been stick skinny. The jabs hurt but ive been trying to ignore them because ive been doing so well. But now even my dad is making comments, like if a grab a cookie because the rest of my family is eating them, hell be like wow youll eat that instead of grabbing a fruit? youre never going to lose weight. Or hell say you shouldnt be eating that, or youre never going to be skinny. I feel like he compares me to my 100 pound 13 year old sister. And everytime a comment is made my confidence gets shredded a little bit, today all ive eaten is a couple of baby carrots, because i feel too discusting to eat again. I dont want to go back to no confidence again, because it deprived me from going to parties and spending time with my friends and so much. What do i do?