Yeah, the shock of hearing something coming to life can feel very similar to the shock of your music being played incorrectly. When I mentor aspiring composers, I tell them it's important for them to take a breath when hearing something for the first time in real life, not just on the computer or in their head. After a little while, your memory of its first life might fade for what is actually real.

Then, if you get multiple performances of your music, you'll begin to see how rich different interpretations are. This is the greatest compliment a performer can give a composer, to teach us everything that our ideas promise. We may originate the ideas but we don't fully know everything they are capable of. Kind of like having kids who grow up and form their own opinions. :)