I am writing this because I am worried about the way my testicles feel. Both of my testicles feel hard. It is the entire testicle. When I apply pressure to it, it doesn't have a spongy feel to it. It only shifts a slight bit in shape when I do and I can feel the overall shape of the testicles being hard. I am pretty sure it was not this hard before. I am 19 years old if this is significant. Is this something to worry about?