I am 15 yrs old and I hav alot of concerns about my penis. I am uncircumcised, ive never had sex and I dont have any bacterial infections when I recently took a urine test.

First, I have these little tiny whitish bumps about 1mm in diameter at the shaft of the head of the penis. However, I do not have any pain or irritation whatsoever, and ive heard these are from the sweat glands and its relatively normal.

Second of all, I sometimes have some pain while I urinate. Ive noticed that this is when my urine is yellow, and ive heard that yellow urine can be painful. So drinking alot of water easliy solves this for me, but why?

I also have some problem after I urinate. I feel that there is still some more urine left inside my urethra (although it may be inside my bladder), and when I sit down or move around, a couple drops of urine would drip out. This can be solved, howver, by simply standing by the toilet longer, as I am able to get out all the urine after couple of minutes. Doctor told me that it might be because of too much caffine, but ive stopped drinking coffee and it hasnt been resolved.

Would these be some symptoms of prostate cancer or any type of cancer? But note that I do not have: a weak urinary stream; difficulty starting urination; frequent urination; difficulty postponing urination; awakening at night frequently to urinate; interruption of the urine stream; blood in urine so if anyone can give an answer to any problem thatll be great. Thanks!