Feeling like an impostor

[Orange]

Hi everyone, lately I have been feeling this very strongly, especially when presented with a new job opportunity. 

I just had a talk with someone who offered me work (in my field!) and I immediately turned it down by giving excuses like this is not really my expertise or, I wouldn't enjoy the work etc. But really i'm just afraid of letting other people down. I'm so afraid of this. 

But so this fear is closing me doors before I even approach them... what is the right way to go about this? 

[Nahm]

Explain this mysterious line in science, the “hard problem”...how the quantum realm and the atomic realm work together. In detail.