I am 13, and have masterbated for my first time today, and when I orgasmed, it hurt a lot in my abdomen, below my belly button, and above where my penis starts. the pain lasts as soon as I actually start releasing the semen. It goes away slowly, and is completely gone after 10 minutes or so. I want someone to be able to tell me if this could just be since my body isn't used to releasing semen, my muscle being tense when it releases semen, or something more serious. Could someone please help?