[anticuchos]

When a person doesn't like to touch foreign stuff (stuff that doesn't belong to him/her) or be touched by it. What is that called?

They are not exactly germophobes, because germophobes will touch things that are foreign so long as it is clean. The type of person I am talking about just don't like touching or be touched by other stuff but their own. They are perfectly fine with their own germ and stuff.

[phillysteakandcheese]

Here's some phobia's that might point you in the right direction:

Aphenphosmphobia- Fear of being touched.
Chiraptophobia- Fear of being touched.
Haphephobia or Haptephobia- Fear of being touched.
Misophobia or Mysophobia- Fear of being contaminated with dirt or germs.
Verminophobia- Fear of germs.

From: http://www.phobialist.com/