It is quite funny but what do I do?

A boy in my class called Will farted and goes to me ewwwwww Jemma that stinks and as he is very popular and I am not everyone laughed even my best friend. :/ now whenever anyone farts they blame it on me. e.g. Sam farted and I said to my best friend yuck and laughed and then she shouts out well you fart all the time and everyone goes ewwwwwwwwww jemma you farted again. sigh.