Nah I don't think you're having a panic attack. I'll describe the last panic attack I got. I was sitting alone in class as usual, when a group of extroverted people decided to come and talk to me. There were like 10 of them. I started hyperventilating, my heartbeat rate went up, even started shivering slightly and started wishing they would go away. Though I believe I looked relatively normal on the surface. Note that I am not 'un-confident', I wasn't scared of them in the slightest. I have social anxiety.