Hey, iblingidawg!
Lance2 and Darkfur are right. A five-inch hard-on will do everything for you!
Don't worry about "average" penis size. There are so many variables that surveys of penis size cannot be accurate enough to worry about.
When not erect, your penis might
look small to you. If you measure it, the measurement might
sound small to you. But most guys think the same: their own dick is never big enough.
Mine varies season by season, hour by hour (not that I spend too much time looking

). When the weather's cold, I have to search around for it. When I'm scared or embarrassed, I have to use a magnifying glass to check if it's still there.
Don't judge your own by comparing it with others. Read Lance2's last two sentences again and believe what he says.