Confidence comes from doing, from trying, falling, adjusting and doing it again. You do not build confidence by waiting until you feel completely ready. You build it by showing up even when you are not.
If you are constantly waiting to feel safe or certain, you will stay in the same place. You will avoid the meetings that challenge you, find yourself saying no to the projects that might stretch you and you will definitely stay small and convince yourself that “this is being realistic”. But what is more realistic is this: you will never feel ready before you grow. The readiness comes after. It is built from what you do in discomfort.