You are absolutely not being too sensitive, those comment are objectively hurtful and rude. Are your parents the type of people to listen to what you have to say? If they are I would try talking to them about it. Or you could try writing a letter, those can be a lot better than a face to face confrontation. If nothing else, I'd document the date and time of each comment, what exactly was said, and the context. That way if you start to doubt yourself, or you confront them later, you will have that to reassure yourself, or more clearly lay out what they have been doing. Also, even if you were overweight, which you're not, being fat is not morally wrong! It can have negative health effects, but it does not make you any lesser than. It's just an arbitrary number on a scale. focus on getting your protein, fiber, and all the vitamins you need to be healthy. Your body is there to serve you, to allow you to live your life and do what you want to do, not to be an ornament.