Terrible time finding my own things. I have developed a system of wall hooks and storage places for my vital items (wallet, keys, iPhone). Still screw up sometimes, and not being able to find something leads first to a feeling of distrust in reality ( I really begin to feel like the butt of some cosmic joke) and if I don't find the item, surefire meltdown.
I am terrific at finding other's people's stuff, for whatever reason. I just try and reason my way to where there stuff should be, given what they've been doing. Never works for anything I've lost, though.