Thinking of running away!?

I need help making a decision..my life at home is hel..nothing I do is good enough, I lost my best friend the other week because of her ******* boyfriend, my grandma is about to die of cancer..and I feel like I am all alone…I want to run away from it all and start fresh…but what are the consequences for running away..and what should I do after I do run away…what do I need to bring..etc….i cant stand my life at home anymore..my parents hit me, last week my parents threw my school books on me, and my mom hit me….she told the cops that came to our house that I ran into something…and another bull s h i t story..so yeah..i need advice..anyone out there to help me?!?! by the way im fifteen athletic, im pretty light and can run long distances..