Does it hurt when you push in and then remove your hand fast? If so, it is probably your appendix. You need to go to the ER for an exam. If you wait, it could rupture and spill the contents of your intestines in to the belly, and you will be very sick and in the hospital a long time. It may be something else, but you won't know until you go in. Go with your parents or good friend. If the pain is real bad call 911, so you can into the ER sooner. Go now!