I have had dreams where I am the only person in the world and everyone else wants to kill me. But the only way I can die is if dirt touches my skin.

The following dream dictionary definition links should help shed light on the meaning of your dream:

abandoned: www.dreamdoctor.com/dream-dictionary/definitions/abandoned.html
attacked: www.dreamdoctor.com/dream-dictionary/definitions/attacked.html
dirty: www.dreamdoctor.com/dirty/dirty.html

If that doesn't help, could you provide some background about what was going on in your waking life so we can help you connect the dots?

Thanks.