When i was a kid i had many bikes stolen. Thru not locking it up or whatever. it is a crappy feeling, whether you are an adult or not. It is why i got into cycling in the first place. it was something a not-very-athletic person could do. while other kids could do school sports, i wasn't suited for them.
I feel your pain, dont let it get you down.
Dorothy - Get another bike. Put in back in the garage. Leave the door open a little. Me, Deputy Drye, Colonel Corley and the Forrest Rangers'll hide up in the rafters and nap the varmints (never to be seen agin) when they return to the scene of the crime.