Basically when I sit down or cross my legs or anything that causes slight pressure on my scrotum, there is a dull pain in the tube around the left testicle (which I'm guessing is the epididymis). I have read up on torsion but it doesn't sound like it because it's not excruciating pain, but I do feel like it is swollen a bit, compared to my right one. What could this be? I have not had sex yet so I don't know if it is bacteria..

Any help is appreciated.