Why am I hungry after I already ate?

Well I must concede to you that you have a voracious appetite therefore you have been eating plenty of foods. Additionally your metabolism is ultra-fast and the efficiency of your body to burn calories is phenomenal! Thus with the fast metabolism you can eat extravagantly but don't exceed moderate proportions because gorging has detrimental affects if it is frequent. With a faster metabolism you'll almost always have bountiful energy to engage in any strenuous activity and perform optimally depending on your perceptions as well as instincts. With my speculation I believe you have the ravenous feeling more often because of your exercise giving your body the incentive of eating more often.