How can I eat so much and not gain a pound?

So my friends always hate on me lol whether it's girls or guys. I can eat everything I want and what ever time I want it with out gaining a single pound or so. How is this possible? Is this even good? I'm sorta affraid out of no where I will just gain all the weight? :/
Updates
+1 y
just realized the way I wrote out my question might be confusing. I meant to say Why don't I gain weight, if I eat so much all the time? hope this makes sense
How can I eat so much and not gain a pound?
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