it makes a lot of sense. a lot of people fall into the trap of over-thinking. its a vicious circle. you're anxious, so you worry about getting rid of it, which makes you more anxious... all i can say is you need to condition yourself. when you're in a group situation, focus on what's going on around you, don't let yourself start internalising thoughts, it will only make you anxious. just breathe in thru your nose and out your mouth. put your foot down in your mind - i'm not thinking this anymore, its irrational. externalise stuff more. your inner self will see you as confident. eventually, you could see theres not all that much to worry about and over-worrying gets you nowhere