I'm worried about my penis size it is 2 inches long when erected and my balls are tiny to please give me advise as this is making me very depressed?

See urologist /psych: You should consider seeking specialist help for evaluation for erectile problems as well as depression. Depression is a dangerous problem.

Seek help: This is something you will want to review with your primary care doctor, as it could be a sign of a hormone deficiency. Unfortunately at age 25, further growth is unlikely feasible regardless of treatment(barring surgery) and your best option is try to work with your doctor /support system to avoid focusing on "size".

Size does not matter: If you are concerned see a good urologist and check your testosterone. Surgery can make the penis look as well. Remember that a woman gets the most pleasure from stimulating the clitoris and 2 inches should be plenty long.