Yes that is a good size. The average penis size for a grown male is:
Th average girth is 5 inches
The average length is 5-6.4 inches.
Measure from the tip or the head of the penis to the base to get the correct measurement.
Yes! You are actually a great length :) What you need to know is that women really don't want a big penis because a woman's body can only take in so much length. The factor that matters is girth, not length. As long as you have a thick penis then you can please any lady (or guy). :)