That is the scar from your circumcision most likely. It is not an STD.

whats circumcision?

Where the skin from your penis was cut away when you were a baby. Most men who live in the west have this done when they are a few days old. You can look it up on the internet - there is probably a wiki for it.

wouldnt my parents tell me that they've done that though? or does it happen alot?

If you don't have a flap of skin you have to pull back and clean, then you have been circumcised. Look it up.

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No, girls don't care. Your friends are all more than likely circumcised too.

alright thx for ur time mabel