Had vdrl&hiv tests, and the report is negative. have pain in testes&uti for months. should i've to do test for std's? or hiv/vrdl tests are enough?

Not these, but...: Neither syphilis (vdrl) nor HIV infection is a major consideration for a young adult man with pain in the scrotum. I suspect you have epididymitis and should be seen by a good urologist.

Several possible...: ...Problems: epididymitis, chlamydia, gc - none of which show up on blood tests. You need to see a dr for this; sometimes (not always) urine tests will show the answer.