Okay, I'm going to enter my annual "Mental readjustment on penis size" post here. I don't do this often, but it IS your birthday after all!
Insecurity sucks, I can't think of a woman alive that will like you if you exhibit it to her. If you demand too much reassurance from her about your size, she WILL reject you eventually because it will gross her out, then you will misinterpret the rejection that it is about your penis, when it is really about your attitude. Take responsibility for this, it is what you DO have control over. I'm not trying to be condescending here, I know you probably know this already, deep down inside, but so often people ignore the things they know inside in preference for some less evolved thinking, which is all that's going on here.
I can't change my skin colour, body type (this was a big one, how would you like to be a foot taller than your classmates at 12 years old and full figured, when EVERYONE else is short, skinny and white?). I'll never be a slender, lithe "gazelle" with blonde hair and tits that stand firmly up on their own. Damn. I hate all Swedish Bikini models! If I go on their website and tell them how much I've compared myself to them and found myself coming up short, I wonder how much understanding they'll offer me? Probably none, and probably no such site exists. This IS a support group for sexuality issues, but there are literally billions more men with this one issue than the reverse. If we aren't somewhat self-editing, the whole board could very easily become the small penis support group, which is not the intention.
That being said, it's not that anyone wishes to be rude or deny compassion, it's just that there's really nothing much to say. Wishing to be in the "extremely rare" category is understandable, but if it ain't so, it ain't so. I'm 5'7", I stopped growing completely at age 12. I WISH I was 5'10", but I can't increase my height one quarter of an inch with all my mental effort! Therefore it is useless energy.
Some truth- size matters to SOME women, but even those who have a strong preference don't all prefer larger. Case in point, I had this conversation with some strippers a couple weeks ago, we were giggling about dicks in general then started talking about size. Out of the ten girls there, two said they had small vaginas and preferred small, a few said average fit best for them, three of us said we liked large. I have no idea how this would stack up against normal society, it was just a random conversation, but these are girls who have all had sex with more partners than average (I'd assume) and at least know their bodies to a degree. Most women don't have a fucking clue what size they are so if they SAY they like large, they are most likely responding to the same bullshit that they are being fed about bigger being better that causes guys so much stress. They really don't know how they're supposed to feel, so they feel how they're programmed to feel.
MOST (by a HUGE margin) women will fall for a guy, a whole package, his penis size will hardly be any factor at all! They will make their judgement about whether they will have sex with you based on whether they like you. Sorry for you guys who like to beat yourselves up over your penis size, but that's true. If you are a boring, sobbiing ass over your dick size, don't expect a woman to nurture you through it. We aren't your mothers, we are you partners, so act like a partner.
There are some women who do have a preference and it is for large guys. Guess what? They are not available to you. Tough shit. There are tons of women who aren't available to you for a multitude of reasons, stop tripping yourself out over this, you know it already. Famous rich supermodels will never give you the time of day, happily married women aren't going to give you any, decent girls who are fucking your friends are off limits to you, the list goes on and on. Size queens won't be into you, damn- scratch about 2% of women off the list and go on with your life, this really is much ado about nothing. If you concentrate of being an exciting lover who listens to his partners needs instead of just worry about fulfilling his own, you'll probably get plenty of call-backs. If you obsess about your dick, well then don't blame your dick for what your head and mouth are guilty of.
Oh yeah, anyone who wants to tell it's dismissive to say "just do it!" is wrong. It's the only honest answer. Just because something is hard doesn't mean you shouldn't be expected to step up to the plate. People have to do tough things all the time, this is just one of them.