Losing weight

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I'm having such a hard time losing weight and I'm getting really depressed. I'm the highest weight I've ever been and my family has noticed and keeps saying "I'm surprised you gained weight, you were always so skinny" and "yea, that's not good you should try (diet)" and it's putting me down more and then my boyfriend keeps saying he loves my tummy and that makes me happy but at the same time, confuses me. I don't know what to do. I need help