I know this is long but someone please help. what does this crazy dream mean?

A dream where the world burnt down, many houses, blah blah blah. I never actually saw the fire. And when I went to different houses to et my stuff there was no remains of fire. But thats what the news said. Me and my friends got a list together where everyone in "the unit" (we used this term in the dream which means the town or something) signed a paper so we knew how many people were here. Me and a lot of my friends ended up at this huge house. with a lot of doors and openings and such. My mom was the only person there and she was taking care of us. The people that were in this house was the guy i like, the guy i really used to like, two guy friends, this girl i don't really talk to, my two brother, and people that were supposed to be my cousins but I never saw them before. My mom was cooking dinner for everyone with one of my other brothers. I specifically noticed she was cutting up artichoke hearts and my brother was cutting up chicken. I asked if they needed help from me or my other brother and my mom said it was fine. I go into this back room, could have been another place. and this guy is sitting eating something like porkchops. And I was like were did you get that and he said I made it (cause he has his own restaurant) and he asked I wanted some. I took some and continued walking into another room where i fall to my knees and i start balling. because it just hit me what has happened to the world. this guy comes up and tries to make me feel better and the whole time the guy i used to like is getting mad because he is talking to me or something. he is just continuously staring the whole time. I'm not sure what happens next but we see this guy pulling up in a white truck. And at this point it was snowing. I stare at him and I notice who he is so i tell my mom, continuing staring I relieze I don't know him and run into the house to get a guy to help. coming back to my mom who was talking to the guy she said he gave us an action figure, which is from a show dexter where in the dream i said what has happened to us happened in the show. I'm not sure what happens next but I am in this car with my mom driving and like five of my "cousins" to go to our house to get some clothes and some supplies. We are driving around to find our house and we see these people outside fighting. but it seems as if the parents were teaching the kids our to fight. as we were watching we see these to girls fighting and the girl beats her up so bad that we drive away, and they were so young like ten or so. We then arrive at this house that I have never seen before but supposidly it was my house that me and my "cousins" lived at. my mom drops us off because she needed to go to her house. as we go inside i go through a different door than one of my cousins. and she can't get in because the door was locked. As I let her in she informs me that it was locked and I didn't see the big deal. and she said "he's in here" (there was a killer going around killing people) and then we turned and we saw him standing there (he looked like the creepy guy from silent hill but instead of the huge thing he drags he was holding huge siccorss.) I just stand there staring and she grabs my arm and makes me run from him. we are sitting in the room on the bed under the covers with the lights off just waiting. I then recieve a text from this guy I know who I don't really talk to anymore and it said "hey i'm in canada (or cuba, something that starts with a c) when do you go back to school (I attend a university)?" but note this whole time i am texting my mom cause i don't want to call her because of the noise. then we hear the guy coming in and he sees us he also bring three of my other "cousins" that he found. and there was this guy that the killer was with and he said "do any of them deserve to stay" and the killer says "no, none of them." and then he stops and looks at me and says "actually one does, Sarah, Sarah deserves to stay because she is the only one who didn't run from me. he makes me hold my arms together and he begins to cut the with the giant siccorss, but only half way because i "deserve" to live. and the blood was everywhere and it hurt so bad. i was squeezing this pillow so i wouldn't bleed out. he then start to cut one of my younger boy "cousin's" arms and he cuts them completely off tells him to lean back his head so he will fall asleep. at somepoint he asks us to put his arm around his neck so he will get blood on it. and that's when i wake up. I remember so many details from this dream that it gets ridicuoulus. and i have no idea what this means. if anyone reads this whole thing will you please help.