How skinny should you e to wear a bikini?

I only have bikinis this summer bcuz I love them on me in the store mirrors but when I get home and look in my bathroom mirror I get self conscious and feel fat. I have a little pudge but I'm not muffin top at all but then again I'm not flat either! Is that bad? Should I go tankini shopping? Is it NASTY seeing people with a little pudge in bikinis haha help! Btw I'm "5 2" and weight about 123-125