I understand how u feel dude,am 29 and am having the same problem like yours.for the past one week i have been having discomfort in my right testicle,its not painful though.I also noticed some little bump there too.
I have gone to the doctor ,he did a scan and x ray of my testicle,he said they are fine ,but that i have a little infection in the scrotum,he gave me some antibiotic,and said i will be fine with time.Only God understands the human anatomy,so don't be worried.But u must make sure u visit ur doctor to rule out cancer first.Take care and remain blessed.God is with u!!let me knw when u visit your doctor
I should also add that I am 15 years old.