My right teaticle has been in pain and sweilling fir last 3 months. scrotum sweats way to much than before. can this be testicular cancer?

Yes: While this could be a number of things, you should see a doctor.

Hard to say: Hard to say for sure online, but can happen in your age group. Indeed ! most of the time this presentation needs a urinalysis and an ultrasound of the scrotum to check it out more. See your doctor soon because early diagnosis of something serious (if it's there) could be life-saving. Many times it is minor, but you need to be checked for sure to rule out something bad.