I'm about 5'7, 130 pounds, not a very big person. My testicles are about 1.5 inches long, and about the size of small eggs. They just look big on me sometimes. Is this normal? Also, are there any cues for detecting swelling on the testicles besides knowing what they looked like before?
Also, the epididymis on my left testicle is bigger and more defined than on my right testicle. Not a huge difference, but noticeable. Is this normal?

I'm also 17 years old and an absolute virgin, dont smoke, drink, do drugs or anything of that sort.

We all vary in size in that area. You sound normal to me. Just relax and enjoy being made the way you are.

Check on Tanner stages testicles for various sizes.