My Penis Is 5 Inches Long When I Have An Erection And I'm Only 13? Is That Normal?

This is funny, 13 year olds asking what the average size of a 13 year old's penis should be, I'm cracking up, but 5 is probably about average for you, lol. Dude with 8, I want what you smoking, I highly doubt it is that big. Most grown men are lucky to be that big.

Thats average for your age or bigger your fine don't worry

Really, 8 inches. I find that doubtful, but ok

Your body is still growing and will continue to do so until around 18/21 years old so at this point everything is normal

Yes.  Some boys hit puberty earlier than others.  I wouldn't worry about it.

Awe.
That's completely normal. don't worry about it.
 
It will get bigger, as you get older.

It is only a tiny bit bigger than average so there is nothing to worry about

It is normal. Don't compare with other boys either because everyone is different. Like someone before said, it's average or bigger for your age. :)

Uhhh... I don't think so....

I'm 13 and my dick is 5 inches too...