Your self-confidence is simply the part of your brain that tells you whether or not you should try something different or new or believe in yourself, and just as a Jedi truly believes that it is within their power to control their thoughts and stay in the Light, so can you.
Gone are the days when 19-inch biceps would once command respect. A Jedi doesn’t walk around with their arms flexed and with a thousand yard stare in their eyes. They walk with a good posture, their head held high and with a serious, yet friendly, look on their face.