Hi.
Thank for your query.
Noted your history and understood your concerns at the age of 16 years and an opinion of your parents. 
You have a dull ache first in the right testicle but now i the left also. 
Getting examination done by a Doctor is never by choice but by necessity of yours getting a proper early diagnosis and proper treatment. 
There is no alternative to getting a proper clinical evaluation and examination by an expert. 
You also need further evaluation of the 
urinary tract by means of investigations :
- 
Ultrasonography and color doppler examination of the abdomen and the 
scrotum as you need the most proper diagnosis.
- Tests of blood and urine. 
- Clinical examination by an 
Urologist or a 
General Surgeon. 
You have to insist your parents for getting properly investigating, getting a proper treatment. 
Till you get one, have scrotal support.
Drink plenty of oral fluids. 
I hope this answer helps you.