Why do people assume?

Why do people assume that because you're "pretty" or "attractive" or "beautiful" you have to be happy and have a good life, and a good sex/dating life, or always have a boyfriend? I get sick and tired of people assuming I have this amazing life. Does this happen to anyone else? Also, if you say this, why do you say this to people? It's something I've heard my whole life and it just pisses me off...
Why do people assume?
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