Okay, I'm 13 and for a year now (I believe), I've been experiencing pain in my testicles whenever I am physically active. If I run for some time, my testes start to hurt and as I continue, the pain only worsens. When I sit it usually cools down, but the pain will continue for days unless I actually stay lazy and don't do anything. It's a very dull pain.

Since I've had this problem for quite some time, I went to the doctor twice and did Ultrasound two times. The first one showed a small calcificate on my left testis, but nothing else was abnormal. After spending some time just dealing with the pain, I had to do the ultrasound again (it was getting unbearable, i wanted a solution). It was the same as before, except the calcificate has apparently, gotten smaller. The calcificate is not attached to anything, it seems. The doctor said it's nothing and probably growing pains, but that seems unreal to me. None of my friends have reported or acted as if they had the problem, and if it was growing pains, why would it just show up when I'm physically active?

Do you have any ideas about what this might be? I'd give additional details if needed. Please help, I'm getting desperate, this is ruining my life. I cannot even be mobile. It takes only about 10 minutes for the pain to activate and it sticks.