Anybody can be happy at any weight. Being happy doesn't mean skinny or curvy or busty or any other thing you are trying to reach. Happy means healthy. As long as you are a healthy weight then there is nothing wrong. I struggled with an eating disorder and am still recovering. Through the disorder i gained an iron deficiency and a lack of vitamin d which almost caused me to pass out at school. If you want to gain or lose weight please do it in a healthy way and make sure you talk to a doctor first.