I am tired of being [called] fat

I used to think that I am not fat. My husband keeps telling me that I am not. But when other people tells me that I am, it's hard not to believe them. Especially when I look at the mirror, step on the scale, or look at old pictures and realize how skinny I used to be. It never helps when people continuously tells me how big I am, even laugh at me, like my weight is some kind of a joke.