zmuucnin

so I'm new to the game, I've watched youtube vids and all this but I'm always getting aggro from a zombie that just wasn't there Then when I've lost them, I go back in to town and I make sure to say away but another one appears for the void >.< And when I'm safe inside a House or a Hanger with all doors closed a zombie appears from thin air, can someone tell me what I'm doing wrong?

doesnt exactly answer the question that I asked, zombies spawn out of thin air, so don't be an arsehole and say that I'm playing wrong, all I wanted to know was why the zombies just appear in front of me