You have one! Regardless of size!
I'm on the last day of a 2 week holiday in the sun and before I came I fretted about wearing a bikini (I even started a thread on it) for weeks.
I've seen every shape and size in every conceivable type of swimwear and it really does not matter a jot what size you are. Nobody gives a shit. I admit I'm not prancing about showing off but im also not legging it to the poolside and slithering in like an eel so as not to expose too much like i usually do.
It's taken me 41 years to realise that nobody looks. So i thought I'd tell you too!