How can you tell if you're very attractive?

What are the major signs?
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Ok here's what I've experienced:

I get stared at a lot from both genders but usually more from guys.
Guys just stare at me but never approach me.
Everywhere I go, some girls hate me for absolutely no reason and get bitchy with me.
My guy friends usually flirt with me.

I've had a few guys obsess over me including my first love who stalked and harassed me for months after I cut off contact with him.
How can you tell if you're very attractive?
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