Fat but not fat!!!!!! Teenagers I need u ?

Im 15 and a half and i feel fat a lot and when i was 14 i stopped eating and lost about 8 pounds and i never really felt good at all. and when i did eat i gained more than what i lost. i was 114 pounds and got to 107 but then went all the way to 120. and that made me feel like so much crap. i usually eat dinner only and i weigh about 112 and still feel fat but i suggest you start eating things again slowly so you dont gain a bunch back . its unhealthy to starve yourself and soon your stomach will start to eat the stomach lining.(i think thats what it is) . and your still not grown into your body completely so dont stress.