How to deal with my sister disrespecting me?

ok so my sister is being really rebelious at the moment its like she has PMS 24/7 she is rude to me my parents and my frnds but recently she has been going through my bathroom draws and taking out my facial creams and squirting them down the sink she has...

already used up half of my moisturiser and I have this pimple treatment that I paid $12 for and she spuirted it all down the sink and it was brand new! I dont want to tell my parents because they get really really stressed because she has been acting like this for a while and they are sick of it! What sjould I do?

if you have a younger sister, just hide your things if you dont want to tell you parents. I know how you feel, or, just stand up to your sister and tell her the way you feel. if you have a fear though of your sister, then I would just hide the important things from her.

sounds outrageous. Just tell her that you hate what she's doing and tell her to stop it.
If you don't want to to do so, just ignore her and hide your things.

I agree...hide your things.

Sounds like she is really trying to get your attention for some reason...maybe sit down and talk to her - ask her what's wrong and why she's doing what she's doing.

I think that you should put the responsiblility of her behavior on your parents.. it is their duty to deal with it. You should not have to. They are the grown ups, let them figure out what to do. They could send her to some kind of place that deals with kids like this... she is way out of line...

If you can talk to her, you might try to find out why she is acting like this.. prehaps she might have been raped or something, and no one knows and she is taking her anger out on everyone because she can't deal with the rage inside, this is just a thought, might not be right at all, but, something is causing her to act like this, if you can find out what, it might relieve the situation.