Is it normal to want a bigger penis, if yours is already "average?"

I have a decently sized penis, but it would be awesome if it was even just 1/4 of an inch bigger. Let me explain with a metaphor: I had a friend in high school who was incredibly strong for his age, he could squat well over 400 pounds, he could power clean well over 300 pounds, but if you asked him what he benched, he would be very reluctant to answer. He benched 295 pounds, and while that's pretty impressive for a 17 year old, it wasn't 300. Back to me, I've measured before, and I'm JUST between 6.75 and 7. It isn't that I'm anal about having my penis measure to a whole number, I simply feel that if it was 7 inches or more that I would feel "big," in the same way that if he could bench 300 he would feel strong. My girl friend doesn't care, so it's NOT a pressing concern for me, but I can honestly say that if there was something other than surgery, that I would try it. Like, if the "andropenis" really works, I'd probably blow $300 on it. Is that normal? (and does andropenis work? lol)