This girl tries to impress me but copies me!!!?

Tiara! Clearly this other female is having a complex and she is deliberately trying to irritate you by posing as someone better than you, which she is not. You cannot control her actions, and thinking about her, as to why she does a particular act, will only make you worry more. The only pragmatic solution for you is TO JUST IGNORE HER. You may write to me if you so desire.