Why do I have anxiety when I imagine myself with girls. I sometimes dont have anxiety with men😭😭😭. I'm straight

I was reading an article and I thought “I’m pansexual” and I felt really calm which made my brain freak out, I’m straight also. The pansexual thought is new to me and if I don’t freak out over it I feel like I’m accepting it.

I wish I knew the answer too.