If people have gone beyond simply expressing that they think you should eat more to pressuring you to eat, they probably feel desperate. Pressuring you probably won't make you eat more, but people who apply pressure usually don't know what else to do.
Has the discussion been going on for a while? It should be easy to settle things. Go to your doctor and ask if you're eating enough. Of course, if your doctor says you're not eating enough to be healthy and you ignore it, then you may be showing more evidence of an eating disorder.
