[xkgt]

I have the opposite problem. I always struggle with frequent interrupts wondering "what if I am wrong?" and I fail to move forward without utmost conviction.

Nowadays I try to tell myself that no one is perfect, especially me. Expecting oneself to be correct all time is actually egoistic even though the end result turns out to be being humble and having self-doubts. To fail or to be wrong is natural. My boss even encourages me to fail sometimes, to be comfortable with the possibility failure. I am not saying that I am doing these things by default now, but at least I make it a point to try.

[seaknoll]

I'd also suggest trying to harness the "what if I am wrong" so you can use it to your advantage - it sounds like the kind of attitude that could make you excellent at testing. If you turn it into a curious question instead of a self-judgment, it may help identify ways to test something that would give you full confidence that it works. Which is a very valuable skill to have.