Agreed with Eddie here. 100k is just what it's rated for under warranty, and it doesn't mean the shutter will fail at that number. Unless you're doing time lapse, or you're a star trails addict, there is no reason for concern, and heck, if you are doing one of those things, you know it goes with the territory.
At the rate I'm going, I'll hit about 25k in the first year. I've been going a bit crazy with it though. There are other parts of the camera I'm much more concerned with failing due to wear. On this forum I've only ever seen a couple posts about failed shutters, and those were invariably well short of 100k, indicating damage or defect.
Relax, enjoy your camera, and work on the assumption that by the time it wears out you will probably be itching for an upgrade, anyway.