if your nads hurt, it’s deffo a bike “fit” issue. could be anything from handle bars being too low, seat angle or height, or too small/too big bike frame. Best way would be too google “fitting your bicycle” or something like that or cruise one of the several popular biking forums out there. Absolutely agree with Elias, biking shorts help a LOT, or at least wear super-tight undies and kinda pull the boys “up.”
@ Stephen–no I don’t ride competitively, but I do ride 10-15 hours a week weather/time allowing.