Are people who brag actually insecure or are they full of themselves?

Anonymous
I have a cousin who constantly brags about herself. We'll be sitting down and she will be like "I have such soft and shiny hair' 'I have a tiny waist' 'I have long model legs" "everyone is always staring at me' 'I have such full and pouty lips.' She is constantly talking about herself, even when the conversation has no relation to it. It gets a little annoying after a while. Does she just love herself or is she maybe bragging out of insecurity of these features?
Are people who brag actually insecure or are they full of themselves?
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