I would rather have doubts than regrets
You're not going to be 100% sure of your success with everything you do. I know I'm not.
That doesn't stop me from having a crack anyway.
Learn to lean into that discomfort and face the possibility of failure.
As Wayne Gretsky once said "You miss 100% of the shots you don't take"
If you're not worried about failing anything then you're probably playing it too safe.