Self-acceptance is the first step of self-confidence.
No matter how much you imitate confident people’s moves you can never be confident like you imagine. Accept your acnes, height, weight, shyness, coldness, sensitivity, weirdness, abilities and other physical and personal traits you have. Accept yourself as a whole. Don’t hesitate to face with the real you. If any improvement needed, do it for yourself, your health and well-being not to impress others.