I'm just not very good at applying processes/methodologies which I don't fully understand.
For example, I wasn't very good with linear algebra until I was able to visualize the equations in my head. For example, now, when I think about the equation 'f(x) = ax^2 + bx + c' - I can see that this represents the set of all possible quadratic equations and I can roughly visualize what that looks like on a cartesian plane (well it would turn the whole plane black because there would be an infinite number of graphs). Then if I choose any three points on that crowded cartesian plane, I can visualize that among this infinite set of curves, one of them passes through all three points. Thinking about it in that way allows me to make sense of Gauss-Jordan Reduction and other mathematical processes related to linear algebra.
Programming is much easier for me because I can visualize the results instantly on a computer - I don't need someone else to explain it to me. Any uncertainty can be quickly resolved by simply running some code.