Anxiety can be physiological, wouldn't be a bad idea to check it out.
The thoughts can be so fast and habitual through your head you might not even notice them or you might no register these thoughts as "negative." For me if I enter similar situations compared to my past I can trigger past emotions from a unpleasant time and barely have any coherent thoughts. You can also have anxiety from anticipating anxiety. It's a lot things. Do you bash yourself after having anxiety? Are you assuming their thoughts or trying to be somebody you are not. Analyze yourself and find your insecurities and fears and see how it might trigger your fear in certain situations. The hard part is usually finding negative thoughts.
The thoughts can be so fast and habitual through your head you might not even notice them or you might no register these thoughts as "negative." For me if I enter similar situations compared to my past I can trigger past emotions from a unpleasant time and barely have any coherent thoughts. You can also have anxiety from anticipating anxiety. It's a lot things. Do you bash yourself after having anxiety? Are you assuming their thoughts or trying to be somebody you are not. Analyze yourself and find your insecurities and fears and see how it might trigger your fear in certain situations. The hard part is usually finding negative thoughts.