I think i might be going through a eating disorder?

I think its minor but i really dont know the signs if i am or not and i dont want to discuss this with family or any one i know so i thought its best i go here to get some advice before its to late. ive always have been cautious about my wheight and always watching it and usually when i feel i gain little too much weight i start putting restriction on my food eating smaller proportions or skipping a meal lets say my normal wieght is around 108 110 if i get close to 120 i start doing things like i said above i dont really have alot of healthy foods so i tend to go on soup diets or eat egg whites things that are healthier i dont continue this whole dieting thing for long only till i get back to where my usual weight is to be i guess. tell me if this is something i should worry about?

Thank you.