Male, 20. Not sexually active. It's embarrassing, but I can't help but notice how small my testicles are. They are about the size of small grapes or maybe even smaller, surrounded by blood vessels (possibly) that I can feel. I can't help but be worried because to my knowledge, they should be larger than this. Any Google searches always turn up as cancer but I've had this particular size for many years now. I remember them as being slightly larger during my teenage years, back in the tropics. There were once or twice during that time where my testicles were uncomfortably sensitive; just having them resting on my thigh was mildly painful, like they were being crushed under their own weight. Didn't think much of it then, thought I had just hit them somewhere. This discomfort only lasted a few hours.