I believe confidence should be an internal feeling rather than a presentation

I think many people's idea of confidence is related to how it looks on another person - relaxed yet strong body language, loud clear voice, happiness and boldness. But I think what confidence really is, is a feeling of self-assuredness, not being afraid of how you are perceived. When you are trying to be confident simply by changing how you look to others, you are avoiding the core of the matter. And ultimately how you feel will influence completely how you act. So yeah fake it until you make it I guess. But your focus should be on being confident inside, not on how you present.