whyyyyy

I was just thinking that I still dont 100 percent know what realllly happens in final fantasy VII, I mean I played it more than once but some ends still dont meet. For one, who is talking in Clouds head all the time, at the beginning of the game where you blow up the reactor Cloud goes all freaky and some one tells him that it is just not a reactor. whooo is it ? or when you fall in the church and some one is talking to you telling you to get up,, who isss it? And what is up with the whole Cloud not really being Cloud. ok. He left nibelheim for soldier, while he was in training for soldier he went on a mission to nibelheim where he was the guard who kept Tifa out of the reactor. so when Sephiroth goes all freaky assed and hurts Tifa and Zack, Cloud swoops in and stabs him in the back, then when he thinks he is safe Cloud goes and gets stabbed in the stomach, Sephiroth picks him up but ends up getting thrown into the reactor core. So after that Cloud faints or whatever and gets picked up by Hojo, where all the freaky testings and junk happen. so where does Cloud pick up the life of all these other people, Zack is dead right, and Cloud has taken on his characteristics... but why? and Cloud is a Sephiroth clone that didnt turn into those guys in the black cloakes..... i dont get someeee of it stillll :(