If everyone have the same mind set as you, there will be no sharing or caring in this world.

For the learning & teaching stuffs, In another point of view, Isn't this is a good opportunity to show your skill & knowledge and impress your boss. Probably may give you chances for promotion or new task.

In Addition, It you the only one that perform certain task, you probably will end up doing the same thing in a same position forever in the company because nobody else know how do it.

Just my 2cents.