Penis Size

I'm trying to find out from my friends what the average penis size is. I know mine is smaller than the average guy with an erect length of 3.5 in. (8.9cm) and a girth of about 2.8 in. ( 7.1 cm). I actually take that as a blessing because it's very easy to hide in my panties. I've been with a few guys and they all seemed to be about 5 in length and 4.5 in in girth. I could take them with little problems. I stretch once or twice a week to prepare myself for that first big guy. as most of you know length is not a problem but i'm worried about girth. I can currently take a dildo that is about 6.5 in. in girth. Are there many guys that are bigger than that?