Testicular pain, please help!?

Ok, so for the past 2 days, I have been experiencing some pain in my right testicle. Usually only when I walk, and it seems to come more when stepping with my right foot. There is no swelling, tenderness, or anything abnormal, other than the pain. I am a virgin, so it can't be any kind of STD. The only thing I've found that sounds reasonable is a testicular torsion, but I had a friend that had one, and the sources online say the pain should be excruciating, which mine is not. Just a throbbing. Any ideas on what this could be?