Chillindan, you sound suspiciously like a completely normal human being.
It's entirely normal to be nervous every now and then. That keeps you sharp. It's also entirely normal to have a bad day every now and then. And it's very good to bring things like this in the open, analyse it and learn from it.
Sleep on it a couple of nights, leave the bad feeling behind, and take the things you learned from yesterday with you. You'll be just fine.
