Having roommates who use your things without permission is always frustrating, especially when there's a complete lack of appreciation, reciprocation, consideration, or at least acknowledgment of the fact that they're doing so. Still, sharing is an important way to build relationships, as mutual trust and reciprocation are key components. So, while people using your things is annoying, being overly zealous about people not touching your things is never going to fly either, and getting overly pe…