condoms get lost in my vagina

Lissette
So maybe there's something wrong with myself or my boyfriend. But everytime we have sex with a condom - it slips off during sex & it gets lost in my vagina. I even tried changing positions and being on top thinking it was because it was slipping off bc he was always on top. 
We've actively tried holding onto the condom during sex (which is a mood killer) and it always falls. It's really annoying to find it.
Is there something wrong with my vagina or maybe he needs a bigger condom size?
Or maybe I'm the only one that it's happened to... But help!! We're trying to stay safe and have sex. 

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