Sharp pain on my right side?

Im 14yo and very active in my sports. I just stopped running track 2 weeks ago and had no pain. I have a pain under my right Brest and have had it for two days now. When I breath in it feels like a sharp pain digging into my side,when i move fast or cough it also hurts. I’m taking slow breaths now so it doesn’t hurt. I thought it may be a stitch in my side but it feels worse than that. Its a sharp pain under my l right Brest that has been there since yesterday evening, hurts taking a deep breath,and moving suddenly. It does not hurt when touched but I keep yawning. Please help I don’t want a pain in my side like this one!