What do I do when my cousin is going to try out for vollyball just because she knows I like it?

Maybe she just wants to be like you but acts like she doesn't cuz maybe she resents you too...are u better lookin than her? Do u get better grades? It can be just to annoy you , to maybe try something new...maybe she's depressed ..is she good at anything ? My advice...ask her...say what made u wanna join? Support her even if u don't want to ...maybe she will back down maybe you guys will bond u never know i had ppl do things i did cuz they wanted my friends before...etc. like i said ask...what do u have to lose? If u don't get along or she gets defensive just be like...ok ...nothing u can really do ...maybe tell her u changed ur mind n see if she does. but I'm upfront id ask