why do you not understand?

Why do people not understand?  I am all alone in this big world I live in.  I try and talk to everyone who I think will listen not only listen but one who truly cares what I'm talking to them about.  I haven't found that in anyone lately.  I'm tired, I'm frustrated, I want to scream from the bottom to the top of my lungs and say hey can't you hear me I'm talking to you.  That's all I want is someone to listen with a caring heart and tell me it's okay I understand, all I need is someone to sit and not say a word to listen while I rant and rave.  I ask myself were is everyone everyday I'm trapped inside my body, i'm trapped inside my mind, my house, I have no one.  Why don't people listen?