I have this problem too.  My mum is more and more often now telling me what not to eat.  "Don't eat too many of them pizzas, they'll make you fat".  I just find it annoying, really, but I try to ignore it.  I usually give off the impression that I'm happy the way I am.  I wish I could just say "I like being fat and enjoy being a fatty!" 
But if you're away in College, you have more freedom, you can eat what you like, whenever you like.  I really envy that!  But yes, as others have said, as long as you are happy that's the main thing 
