does anyone else hav this problem?

ok so there is this gir at my school named katelyn and she acts like she is all that and she yells at me for getting in her business when im not. she asked the question in general so i answered. and she keeps stealing my friends. she told kaylee i didnt think she was a good friend and i have been friends with kaylee for 5 years! And now she is flirting with my guy!!! im getting really pissed. and she said she was hanging with you and riley first when i was already! >:(

and she flirts with the guy i like and takes my friends. she will hang with my friends then say " i was hanging with them first! you caa leave now! " and i turned around to talk to one of my friends and she was like " is your name austin? i didnt think so turn around " then she pushed me to make me turn around. and she asked a question in general and i answered and she was like " am i talking to you? " then i will try to talk to one of my friends and she is like " stop getting in our conversation! " and today she was talking about me behind my back when i could hear her. and she is being really rude my friend tripped and fell and touched her leg and she is like " get off me! " she is blonde and she is dying her hair just like im about to get mine! she is a fucking copier! i need advice!