Hi luvin eye full
It really just a matter of perspective. If your penis is long enough to reach your body, it's long enough.
That being said, it seems all guys at some point compare themselves to others - initially to see if they "normal" or average. It's when we find ourselves coming up "short" that we begin to obsess. It doesn't help matters that guys don't usually see other guys naked when they are hard. There are "growers" and there are "show-ers." When erect, there isn't that much difference in penis size, but if you are small when flaccid (a grower) and you see a guy next to you in the locker room who is sporting 6 inches when soft - it's rather difficult to shrug that off. Also, no matter how long one's dick is, we all want at least one more inch.
Of course, the problem is often compounded by those who are well endowed - and know it. When they notice the "respect" of other guys, sometimes it goes to their heads (pardon the pun) and they begin to tease the less fortunate. That makes you really self-conscious and you learn to turn away and hide yourself. I, myself, was teased (a grower, but I later learned I was really average length when I sported wood) and as a result tried to avoid showers after gym class (fortunately I didn't have any sweat related body-odour issues). I have since gotten over it, and can shower at the gym - I don't even rush to cover myself up with a towel anymore. Even though guys turn me on too, I can manage to avoid an erection in the change room.
And speaking of the "respect" guys have for other guys with large dicks, when I was in grade 6, I went in the washroom one day and there were a bunch of guys gathered around the sink. One guy (an "early bloomer") had his cock laid out on the counter, being measured. He was thick and measured 10 inches long! I would have liked to get closer for a good look but was afraid of appearing "queer." All the other guys were saying, "Wow" and their admiration was obvious. Somehow it was "not gay" for them all to be staring at his cock. I later heard that he made some porn videos when he was in high school.
Another factor involved in comparisons is foreskin and pubic hair. I was a "late bloomer" and couldn't help but notice other teens (who had reached puberty) and grown men had noticeable bush while I did not. Also, many had foreskin covering their knobs, whereas I did not. This was before I understood anything about puberty or circumcision and made me feel different. Was not sure what to think about the vein along the top of my dick either. Along with the size issue, I found myself staring at as many naked men as I could to understand what "normal" was. Now I am really turned on by muscular guys with dense pubic bush, generous foreskin, and a nice thick cock (7" would be plenty). I guess we are attracted to what we don't have ourselves. I find women attractive too - I fell in love and married one - but decades in a sexless marriage has taken its toll and I find myself fantasizing more about men. I would love to take part in a MMF three-way but my wife would never go for it. She isn't even interested sexually in one man, let alone two.
One other thought, I was first introduced to porn by an older brother. I was all excited about the chance of seeing a woman naked and didn't know what to expect. I knew men had a dick (didn't yet know it was properly called a penis), and was familiar with my own, but girls were a mystery. Not sure what I was going to see, but all they seemed to have down there was some bush. I was disappointed. I didn't realize their "parts" were inside, and my brother didn't think to tell me. Neither did I know that the dick was designed to go inside to play (or that sex led to pregnancy). I was woefully ignorant. All I had heard up to that point was that sex was "dirty" and "disgusting." No one clarified that sex within marriage was (supposed to be) the most fantastic, intimate pleasures one could share.
I wonder how my life would have turned out if I knew way back then what I know now.