Lifestyles condoms did a survey that showed the overwhelming majority of men fall between 4.5" and 5" in the girth.
Click here: Lifestyles Survey There are others (Durex, etc.) that place the average slightly higher, and others that support this survey. From what I’ve seen 5" is safe guess at average girth - even the grossly distorted and specious PenisSizeDebate site agrees with this.
Rest assured, by any of these surveys you are significantly above average. Nothing ‘skinny’ about you.
Even very ‘small’ gains in girth register. Try wearing a clear silicone cockring unbeknownst to your lady and see what I mean. A cock ring, properly worn, can give you a small increase (.1" or so, maybe more depending); your lady will definiitely notice.
A lot of folks here are shooting for 6" - a size which is very unusual as a natural phenomenon. It will also change the nature of what can be done for you in the blow job department. Be careful of what you wish for…
As far as feeling like your cock is skinny… Well, it isn’t. It’s a very respectably thick dick.
Before: I'd like to show you something I'm very proud of, but you'll have to move real close.
After: I\'d like to show you something I\'m very proud of, but you guys in the front row will have to stand back.
God gave men both a penis and a brain, but unfortunately not enough blood supply to run both at the same time. - Robin Williams (: