A childhood belief about rude bits

Until I was in college, I truly believed I had three testicles.

For most of my life I was self-conscious about my body because I was so obviously different. From an early age, I knew people should only have two, yet I very clearly appeared to have three. I was so self-conscious, in fact, that I never spoke to anyone about it or asked anyone if it was a problem.

While in college, I began to have acute pain in my abdomen. I found I could lie on my back and the pain would eventually subside. I also noticed that my "third testicle" seemed to disappear during this exercise. I did a little research and came up with a theory that needed proof. The problem became progressively worse, interfering with my daily routine and studies. I sought medical attention, and the (now obvious) diagnosis was made:

I had been born with a hernia that had never been caught.