We’ve heard the story before: the brain has two halves, and the right side is the “creative” side, the left the “analytic” side. And people are either right or left brain dominant.
It’s a myth. There are some localized brain functions, but modern science is proving again and again that the entire brain is used; the brain is a system, a whole. This post explains it well.
Reality is, you use what you need to, and practice makes better. Humans are good at two things: adapting and making routines. Yes, they are contradictory, but it’s true. We are wonderful at changing, but also very prone to habitual actions, thoughts and so forth.
In other words, don’t make the excuse that you are right-brained and “cannot understand” math. Or that you are analytic and have no eye for art. Better, say you don’t like such-and-such. Or you don’t use that ability much and are out of practice. If you wish you were better, then practice it.