I had a really weird dream, can anybody help me make sense of it?

Last night I had a dream and it's been really bothering me today. At the start, all I could see was my older brother's car, mangled in a ditch. (he's 18, I'm 16, almost 17 and we're very close. We work together and spend almost all our free time together, he's my best friend.) then it's the next day at school and I can see all of our friends crying and talking about us. The whole school is upset, and I'm just watching it all. I can't talk to anybody, whenever I try and say anything to anybody it's like they don't hear me. It's just been bugging me so much. Can anybody help me with making sense of it?