i have a sharp pain at the bottom of my scrotum whcih comes every 1 minute, and lasts for a second or so, the pain is like a pin

Could be epiditymitis, prostatitis, chronic infection, pinched nerve or other condition.

Here's a personal experience post from the Internet: Doctor told me scrotum pain is from a nerve in my back. i have been told not to sit for six hours straight at my desk but to get up every 20-30 mins and walk around. i have been doing this for the past week and my aching has gone.

Pain could be a indication of a serious problem and you should seek the advice of a doctor.

Scrotum pain, infections and awareness videos...
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