being naturally skinny problems

Not pregnancy related ( obvi. ) I'm naturally skinny and I hate it. I wish I can gain weight but it's so hard for me to. Its pretty offensive when people tell me stuff like " do you eat ? " or " you should eat more "

Like how about you shut up cause you don't know anything about what I'm going through. I'm already insecure enough... Seriously, some people should learn to not talk about someone's figure in any way.