Also, no matter who you are, you get to a big match and see the speeds that veteran competitors are running at and it's overwhelming. People tend to focus on how fast someone else just went, and focus on that speed, to their detriment. You're going to feel slow, and that's perfectly okay. For a first match you should really be focusing on safety and fundamentals. I think with you coming into this later in life, and not being full of testosterone puts you at an advantage and makes you a good learner.
Last thing. If you're getting all zeros, or A/B zone shots, then pick up your pace until you aren't. That will let you know when you're at the edge of your current ability, and in the doorway to your next level of skill.