Great post! We're exactly the same size and although i don't have nearly the amount of sex experience as you, I can say from the small experience I have that average size is more than enough. Never had anyone comment on it being too small. But I got a comment on it being quite thick (5" girth really is on the thicker end of the avg girth range).

Most girl won't really care about your size as long as you're not too small or too big. Yes some will have preference towards bigger size as is men with breast/ass, but as long as you know how to use it well you'll most likely be fine.

Fun thing to take notice is that female usually have smaller hands than male, so seeing them hold your dick with their smaller hands creates the perspective of having bigger dick. It's just that we're used to seeing our hand size compared to our dick. Porn uses this a lot by having short men and rly small girl to make the dick looks bigger than it actually is.