Pain in below right ribcage?

I am a 15 year old athletic kid. I am in perfect health but today as I was jogging down the street, the bottom of my right ribcage started to hurt. I think it was not the ribcage, but one of the organs underneath it. The pain was somehow linked to my breath because as I inhaled, the pain got sharper and faded as I exhaled. Can someone tell me what this is?