Starving all the timeeee..why?

so im a healthy weight of 140 and im 5'9 but im always eating cause im always soo hungry. some days i hardly eat though (forget to or cant because of cles/plans). so my weight stays the same and sometimes drops a couple pounds. im SO hungry i always feel like im starving. today i ate chicken noodle soup and crackers and OJ (lots of it) then had for dinner two pb sandwiches and loads of white cheddar popcorn and milk soo why am i a raging beast lol. i could eat two whole pizzas by myself. in fact i have.