I think this is very common. The lack of confidence thing, because we see mainly big cocks in porn. They however are the very rare people, and that is how they get the jobs. So the thing is who do you worry about. The people who say that the cock size matters, and bang on about it over and over again. Or the person you should be thinking about pleasing...the woman or women you are with. Our society has a lot to answer for. Also remember this. We evolved this way. Mainly so that you have more chance of getting your mate pregnant.