Why am i always hungry ?

well i've been powerlifting for about 2 years now and well i went from weighing 132 @ 4'11" to weighing 211 @ 5'6" .which people have not been able to believe they think i'm on something like steroids but i just eat alot i think i just have the genetics to build up really fast and i have great leverages for lifting must also be why i've been able to grow so much because i can lift more easier ... and i'm at a rather low bodyfat for not doing much cardio around 15% but ever since i started powerlifting i've gotten really hungry like i can eat to the point of bursting and then 4 hours later i'm hungry again and i can repeat the process but i choose to just eat every couple of hours but i get really hungry is it just due to the fact that my body is doing all this extra work and needs more calories and nutrients or something else ....i've always been hungry all the time but not like this ..i'm wondering if my stomach digesting food this fast is a bad thing or just normal of powerlifting