Confident Body Language
Think about what gives an insecure impression. Think of a person you find looks insecure. What does that person's body language look like? When one feels insecure, one often tends to shrink a little and avoid looking people in the eyes. This signals insecurity.
How can you give a confident impression? Practice straightening your back, look yourself in the eyes in a mirror and say, for example, 'No, thanks. I don't drink alcohol.'
Test it in reality. When you speak with a person in a store or with a friend, practice standing tall and looking in the eyes when you talk to the person. Then notice how it feels! Signaling confidence can boost your self-confidence!
Little A lot
Insecure Confident