Too Slow

I have impostor syndrome regarding my job. For my work I need to learn math concepts, and I haven’t done a training in math as my peers did. My unintentional model is simple as this:

C: Me in front of new math concept
T: I am too slow in learning this
F: Defeated
A: Quit/ take a break / slow down
R: I am much slower than I could be

I have written some alternative intentional thoughts by myself, but I’d be curious to know how you coaches would start approaching this. The underlying story is that I lack skills to be competitive in what I am doing.