Well, if you read this article carefully you could notice this:
If you find any kind of lump, fluids or any kind of asymmetry- you should seek for medical help immediately. Although, it doesn’t have to be a cancer- it can spread if not stopped by the early diagnosis and treatment. Only a physician can make a positive diagnosis.
Of course, these symptoms do not indicate only on presence of testicular cancer. As a matter of fact- most lumps in the scrotum are not testicular cancer. Other diseases and conditions that can produce testicular lumps include
1. Epididymitis- inflammation of epididymis
5. other kinds of benign scrotal masses
Anyway, if you have most of the sympotoms:
1. tenderness or enlargement of tissue inside the testis
2. big amount of fluid in the scrotum- condition called hydrocele
3. a dull ache in the groin area or abdomen, especially the lower part
4. feeling of unusual heaviness in the scrotum
5. unexplained fatigue
, then you should see your doctor!
However, you're too young to get testicular cancer, so I doubt on it.