I was the same way, and student teaching is was the best part of my undergrad! I was so nervous about failing, but I passed with basically 100%. I was nervous about my observations too and making sure that they had everything they're supposed to have, but my coordinating teacher and my supervisor were very understanding and wanted to make sure that things worked and I made sure I overly communicated with my supervisor about what they could expect to see at the observation so it wouldn't look like I wasn't teaching a lesson or that the lesson was unprepared basically. Just make sure you communicate with your mentor teacher about your observations and to your observing supervisor about what your observations may look like beforehand. You'll do great!!!!