A pretty girl who is a pretty receptionist can be insecure. I don't know what Melina did before the Diva Search, but I guarantee her beauty played into it. And now she's a Diva. For the past six months she's been in a profession where everyone around her (the audience, for example) showers her with praise for it.
I seriously doubt she's insecure.
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Sometimes, the people in power, like Vince, love to create insecurity amongst their workers. Some, like Vince, might even call it "motivation" since it's the template that wrestling promoters have used for decades in getting their talent to bust their ass, consequences be damned.
Honestly, I didn't think Melina was scorching or anything hot she first started out in UPW. Nice girl though. She's a tomboy who at least looks good in short skirts.