You absolutely can be good at your passion, but can easily take it for granted. The problem lies in the use and understanding of certain terms. I was an art prodigy, but never considered art my "Passion", despite the hundreds of hours I committed to doing recreational drawings. I liked art, but never thought that I "Loved" it. The reality is, I never would have voluntarily invested so much of my time, had there not been a genuine love for it. So many of the things we become good at are passions by another name, as we get thrown off by semantics.