You have a skewed idea of average, judging by your thread title. If you're 6" in length, you are firmly in the average range, not on the low side.
Self-reported studies give the average at 6 - 6 1/2".
Medical/scientific studies put it at closer to 5 1/2".
You decide which is likely to be more accurate. :smile:
Anyhow, welcome to LPSG. I hope your stay is a long and happy one.