Family not suportive of veganism...?

I want to become vegan (I'm not vegetarian, just a plain meat eater.) but nobody in my family supports me. They don't understand why I refuse to eat meat and other products from animals (besides health reasons, I don't feel good to eat animals as I love them). My granny keeps pestering me about my food choice and it wouldn't surprise me if she snuck something animal in my food (a reason I avoid eating at her place) and my mother doesn't buy me the foods I can eat or she ''forgets'' to. What should I do 'cause I won't change my beliefs and my family doesn't understand my choice ?