Most Helpful Guy
Self-knowledge is one of the biggest components of confidence. You need to know what you're capable of and where your strengths are in order to feel confidence.
Dressing well and having good posture are pretty helpful as well.1
Most Helpful Girl
Pretend there's a 'fuckit' button for every situation you're having trouble with. When in doubt:
1. Hit that 'fuckit' button.
2. Proceed while not giving a damn.
QED. Confidence is really just when you've hit the point of 'dont give a shit, imma do it anyways'. Its easy for me to project a semblance of confidence because I really just don't give a shit and I'm good at pretending like I know what I'm doing.1