Embarrassed? No, not really. Incredibly insecure and nervous, but not really embarrassed....maybe a little bit, on a site like this, hangin' with the big boys, I feel a little embarrassed.
I had warned my ex before we had sex that I was not very big, then she whipped it out and said 'you're such a liar' (or somesuch), but I can't help but think that she was just trying to protect/inflate my ego...
In any case, I saw your pics; you definitely have a large one, and no amount of "denying" will change that (just as no amount of validation will convince you otherwise, I'd guess)...