Remember, a computer is just a box of components. You can't really break it, and messing something up is just part of being a user. Many things on a computer can be fixed in a matter of minutes. As with any new learning experience, it's expected that you'll make mistakes. I don't like looking 'stupid' in front of my colleagues or students .
Nobody likes to feel inadequate or intimidated.
But remember, the only stupid question is the one you don't ask. Computer software and hardware change every year. Therefore, the experts are still learning themselves. The experts do, and so should you. It will take you longer to catch up to your peers and your students if you put off learning about technology now.