consider these questions
1. are the people around listening to your conversation? if so, is it everyone? or just one person? do they notice what's happening? what do they see? what do they hear?
for example- i find that sometimes people will notice. and some people won't notice. the people that notice will see me go up to a girl and talk to her. if they're listening, they'll also hear what i'm saying.
2. what are these people thinking? (your guess)
example- i think that some people would be amused by whats happening and take an active interest. this is what i do when i see a guy trying to pick up a girl. i want to critique the guy and see if i can learn anything. or learn from his mistakes.
i also think that some people wouldn't really be that interested.
i think that some people might think i'm a creep.
i think that some people might be amused as if watching a television comedy. they might be chuckling inside.
i think that some people might cheer me on.
3. what is your reaction to them thinking this? (not just anxiety, but also the thoughts that are going on)
example- i don't want to be critiqued by someone else when i'm doing this.
or
i wish people would **** off and mind their own business.
etc
really psychoanalyze whats going on here. and maybe you'll have a clue for how to overcome this anxiety.
many people also have difficulty approaching when there are other people around. you're not alone! i do as well.