bastid ... congrats
my girl can take me just fine even with a cock ring on ... which is close to 5.75in girth. In fact, my girth has never been an issue with anyone, so being 5.5 isn't anything great, and hence why my goal is to get to 6" at the very least.
I'd venture to say most girls can handle anything under 6" pretty easily ... of course there are outliers, but on the regular, that's not "big" for most girls. I'm talking about girth btw ... as I feel that's most important (as long as you're average or more in length).