I fairly lightly hit my testicle around the area where the spermatic cord is. if i damaged or detached that would i be in extreme pain?

Here are some: The structure of the sac (scrotum) & its contents(testes & epididymides) can dampen a lot of sudden speedy impact for protection; of course, there is a limit that they can absorb and stand. Beyond its limit, various degree of injury occurs as contusion or rupture of blood vessels or rupture of testes... resulting in a wide range of pain depending on the degree of tissue tension & inflammation.