Why does my friend copy everything I do?

She copies the way I dress and I feel like anything I achieve she always tries to do better than me and show off.. job wise and everything. I bought my first ever car (a 2015) she bought her own not even a month later (not even having a license) a brand new 2021 car. whenever she would come in my car I see her looking at all the decorations I have for my car and next thing you know she copies and puts the EXACT same decorations that I have in her car same placement and everything. Even her mom has told my mom that she wants everything I have. It’s honestly creepy
Why does my friend copy everything I do?
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