My older sister is so freakin annoying!?

Well if I just make funny faces she'll be like shut up! And she's 3 years older than me and she hates it if I wear her clothes and she wears mine and I tell her don't wear my clothes then she repeasts what I say but in a baby voice!! And she's al ways on the phone with this guy and she comes into my room when I'm in there and starts laughing really hard in my ear and when I tell her to leave she says shhhh I'm on the phone! So id push her out and then she would say dang my lil sis is being so mean to me right now! And then they would talk about me on the phone and I can hear everything! And if I like a guy she always trys to steal them, I'm a little fatter than her and I feel weird considering I'm the younger one and I have a bigger chest than her. Is that weird? And please tell me how and can stop my sister from making us start fighting all the time and I'm always in second place if we do something the same as each other! But please help me. Thanks