Long story short:
Im 24, been with boyfriend for a few months. Every time i see my boyfriend's mum she comments on how tiny I am - I am tiny being 5'0 and 7 stone 4 but I dont need to be told 24/7.
It's like his family see it as my defining characteristic with his dad telling friends when they ask about me as boyfriend's new girlfriend that I'm the tiniest, petitiest person they would see 
His teenage brother said I was really pretty but really short to my boyfriend behind my back (boyfriend told me they had an argument about it)
And it's getting me down. Yes i'm small but that's my body and something i cant change so I hate how every time I'm at their house I feel conscious about my height. My boyfriend doesnt make me feel bad about it and tells me his family love me but it's just nibbling at my esteem