There does seem to be a difference between saying that you do something and saying that you are something. Though the word’s definition may not require it, most feel a bit hesitant to describe themselves as something they are not quite proficient in. That is, something that doesn’t truly describe a portion of who we are, perhaps beyond the craft itself.
I have taken martial arts for 25 years and have studied many styles. However for a great deal of time I would have described myself as a student or say “I take martial arts”. However at this point martial arts has affected who I am, how I view myself, and how I view the world. I can say with pride, I am a martial artist.
So though I may technically be a bowyer, having made bows, I would not yet describe myself as one. I hope that someday this passion will have affected who I am as a person in a profound way. I will then describe myself as a bowyer.