As there are a couple of reasons for this to be happening, you might take a look at this site as it has a lot of information about what you are asking. Also as I assume you're a teen, my kids seemed to be hungry all the time but grew out of that stage as their metabolism slowed down. But read this site for some possible reasons also.
Why You Still Feel Hungry After You Eat
www.easygoodhealth.com/5-reasons-you-still-hungry-after-eating
