Oh, boys and size.
Average penis size: 5 and a half to 6 and a half inches. You're good.
Girth, make sure you measure it going around it, and not through it. You should be now around 5" girth, which is good.
Will it grow? Yes. How much for how long? Only God knows. Every single human body is different. You might get another extra 3 or 4 inches, or you might get no more. And it usually grows long first, thick then.
I know you already know, so I won't lecture on the "it is not the size of the sword but what the swordsman does" because you must already know it. The size that is required to have a successful penetration is 4", and you're way beyond that. And, yeah, penetration is just one side of sex. Sex is not always about penetration. There are thousands of other stuff you can do, and thousand ways to stimulate a woman without the direct use of your penis. (Long tongues are useful too! :p)
Good luck man!
-Jean
Who is looking for a good swordsman with a good sword ;)