Length of sex

Kayla • 20 with the most perfect family. Blessed with one handsome husband and one perfect little chunky 9month old baby girl.
My fiancé can't last longer than 5 minutes with me. I'm beginning to think it's me ever since me and him talked about sex with exs in the past and he told me he had sex with someone for 5 hours and 45 minutes! I can't believe it... Is it me? The longest we've been is my birthday and our first time. He always gets off but I have a harder time he doesn't know it either.