I always feel so dissected...?

I'll try to make this short and to the point. My parents are constantly looking for something wrong with me. "I don't eat enough, I'm dropping weight, I don't take good enough care of myself, I'm so defensive." <- Just some examples. It seems like everything I do, they're always looking for some underlying issue. I don't even feel comfortable in my own home because of it.... I've got enough insecurities, I don't need my parents pointing them out to me. I've tried explaining this to them before, it's not working. I understand that parents do worry, but it has just gotten to the point where I feel belittled. They sit and whisper about me while I'm in the other room. Any advice?