Re: Testicle size and shape
A little bit of asymmetry is ok. If one of them is 3 times the size of the other, that would be cause for concern, but I doubt that's the case. And, yes, they are supposed to be sensitive if pressed on hard. Getting hit there is only funny on TV.
Young men should make a habit of periodically examining their testicles by sight and touch, checking for sudden changes that could signal testicular cancer or another illness. Good for you, for doing it.