Here are some key ideas I (try to) follow.
1) Become Your Favorite Actor/Actress. I don't know if this works for others or just for me, but what I've done (and still do sometimes) is pretend I am an actor playing a role. I choose the actor that best fits the role I am in. So if I need to to seem cool and suave, I think Sean Connery's James Bond. If I need to be intellectual and a bit cold, I channel Benedict Cumberbatch's Sherlock Holmes. Somehow pretending I am just acting a role takes a lot of social anxiety away. Even if someone reacts negatively to you, they haven't really, as they have only disapproved of James or Sherlock, not me. After a bit, you stop even thinking of the character and just naturally begin to feel at ease in the role you want to play.
2) Slow Down Everything. Walk slower, talk slower, react slower. Do everything a bit slower. You get two benefits from this. First, you'll find that by slowing down, you'll have more time to think through want you want to say or do. That leads you to speaking and moving more deliberately, which makes you look more confident.
3) Watch your body language. Your body language leaks out a lot of info about you. If you are nervous your body language will betray you. The cool thing is that body language not only shows how you are feeling, it also can influence how you are feeling. Choose some confident body language and you'll feel yourself becoming more confident.
These 3 ideas together are powerful. They get your body, mind, and timing all synced up and ready to be at your best.
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