Looking for a movie don't know actors or title, it's a weird horror film,

All I remember is in the beginning or so there is a white girl that is masterbating on a the bed, after she just took a shower, at then she looks out the window and see's a killer that she saw a at gas station, so she quickly drys the sink and shower and hides under the bed, while the killer kills her friend and family,

But at the end of the movie it was her that was doing the killing

High Tension (http://www.imdb.com/title/tt0338095/)

Hell Yeah!!

This is a dope azz movie. Love this flick