what could this movie be?

it was on tv once i watched it and i forgot the name . some guy in high school, hes like popular and really smart, he has a friend that gets bullied by a girl with 2 guys. i remember this scene where he didnt get the girl what she wanted so she slowly stabs in between his finger nail. shes a cute girl. one night the popular smart kid walks down the road i think he was drunk and the girl (bully) with the 2 guys pull over behind and beat him to the point where hes dead. but then he comes back to life, but no one sees him or can hear him.he goes to school not knowing what happened. untill he relises. then he goes home and samething with his mom. she doesnt hear or see him. everytime he touches something or knocks something down, they just appear at the same place again if u know what i mean. and i really cant remember what happens in the end. but theres a hospital scene.

much appreciated guys.