I have the power to overcome my doubts, worries, and fears.

Overcoming does not usually mean the doubt was removed and then you proceeded. Almost nobody gets that version.

What actually happens is that two things are true in the same body at the same time — a person entirely unconvinced they can do the thing, and that same person doing it, badly at first, on a Wednesday afternoon.

Power here is not the ability to delete a feeling. It is the ability to act while carrying one, which you have already demonstrated more times than you have counted.