Why is my best friend such an attention whore?

I can never feel good with my friend around. If I post a picture she has to post one the same day but more provocative and has to make sure she gets more likes. I'll post a picture in our group chat to ask if its alright and if everyone likes it SHE has to post one in the gc right after i do. She always needs the spotlight on her and its starting to get really old. If I'm going through a rough time and tell my friends for support she all of a sudden is too and starts crying so everyone comforts her. If i tell a story she cuts me off and starts telling her own. I honestly just think she's an attention seeking bitch like god forbid someone pays someone other than her attention its so annoying. She sees everything as a competition and its so fucking annoying.
Why is my best friend such an attention whore?
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