This is tied to conversation but it applies to many human interactions.
Whenever I talk to my class, a teacher, or another person, I get so scared and nervous that I'll mess up. I'm terrified of making a fool of myself and having people hate me because I act like an idiot. Whenever I'm done talking and I see someone whisper I assume they are talking about me and how bad I did. It doesn't help that when I talk about something my tongue begins to feel thick in my mouth. I talk too fast and always mess up.
After these periods of talking I go through every sentence, every word and point out all of my mistakes. My heart rate and breathing picks up. My chest feels heavy and I have the sensation that I need to ban my hang against the wall because I'm an idiot. I can't do anything right without messing up. Now I try to avoid all possible conversation unless I have it planned out.
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This was a general idea of how it feels o talk to people for me. This can or cannot apply to other people suffering from social anxiety. Like I said it's different for many people.
I hope you are learning something about these stories of the struggles of anxiety.