I know I'm a guy and this is probably a question for the ladies, but from the age of around 14, I've always had a hero in my life.
He was the best-looking, best-fighter, best chatter-upper of the girls at school.
His long-time girlfriend said, one day, that he had a massive cock and held her index fingers out to intimate his dick was the size of a cucumber. Me and the other guys present were so totally intimidated by him and his penile prowess, at this.
All my life I envied him, but we got together with a girl (20 odd years on - and my lady, as it happens, who had told me she was cool to have sex with two guys, if I was also cool about it) and he said "WTF is that!!!" when I disrobed. "It's a fkn monster".
My gal was happy as Larry to be able to prove to me that which she'd always told me (but I'd taken with a pinch of salt) that I was well built.
All those years of hero-worship and now we're equal, in my eyes. I'll never be as handsome or funny or comfortable with the ladies as he is, but knowing I'm "packing" has brought me out of his shadow to a degree.
The best thing is that he's told his own lady about me and she's now started showing a keeness to find out for herself.
In answer to the question, Yup - there was a time when I thought average was bigger. Too long a time, in my experience.