Was I (19M) feeling nervous before being intimate with my partner (23F), or was it something different?

I've been chatting with this girl (24F) for a few weeks, and a few nights ago, she invited me over to her place after we finished playing games. I had never experienced anything like that before, so I was incredibly nervous even before I left my house. Everything went well at her place until we started to get more physical, but I struggled to get aroused. I'm trying to determine if it was just my nerves or if there was something else at play. I should mention that this was my first time being intimate with someone, and I think it was mostly anxiety, but I’m too anxious not to seek a second opinion.