Why am I not fat(i dont wanna be fat but damn)

i am pretty lazy*i do walk and clean and stuff*
i eat semi healthy foods and plenty of junk foods and drink sodas
but I only weigh

115 lbs i'm 5'2

I know how that feels I do the same and I weight like 80 something.. you probably have a high metabolism. Which means:the chemical processes that occur within a living organism in order to maintain life. In other words... it makes it so you can't gain so much weight. And I don't think you can do anything about it. But, as you get older it will weaken and then you will have to watch out more for your weight.

Hope it helped :)