Why does my friend compare herself with me?

Like my friend constantly compares herself with me especially around friends & like she starts saying that she's taller, & that if she didn't have such a hard life she would be better than me at a lot of things & other times she says that if her parents were "rich" she would be like me but that she would still be hardworking and stuff, & just etc. so it just bothers me 'cause its like she uses me as a scale...
Why does my friend compare herself with me?
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