Like being sterile and stuff

I mean my friend Cristian had a whole buncha sex unprotected and without any preventative measures and eventually he realized he was mad sterile and he was happy at first cause it meant there was no real threat of having a child if something accidentally happened but then he got mad depressed when he realized he could never hope to have a child of his own.

I'm just scared that my entire family line is ending with me, but I'm staying single anyways