Should I change myself for a guy?

Gabriela
A guy I cared about doesn't want anything to do with me anymore. He's now talking to a really pretty girl. I feel like she's so much better than me. I want him back. Should I change my physical features? I have curly hair, she has straight hair. I don't wear as much makeup, she wears a lot. She's skinny, I'm thick, should I start working out more? 

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