what movie is this?

I remember a movie that I watched as a kid where it shows a guy who’s viewing his past self as a ghost learning about his own death. it had a scene where he went to school and got ignored during roll call not knowing he was in a ghost body and his real body was lying dead somewhere. I also remember a scene where this guy shouts at this girl and the girl turns around to see that nothing’s in the hallway but this dead guy is standing there desperately wanting to be heard. I’m going off the top of my head about a movie I vaguely remember about 10-15 years ago but I really wanna rewatch this movie.