It's a creative endeavor. No one can explain their creative impulse to those who don't have them. Whether you paint or sculpt or sing or play an instrument or make art in any form, it's because you are creative and have an actual NEED and drive to do it.
There are people who will never get it, but it's because they don't have creative DNA. Personally, I'd feel sympathy for them because they don't have it, and wouldn't feel the need to explain that I do.