Then almost every title in this world holds no value. I play football once, so I'm a football player. I draw sticks and stone once awhile, yes I'm a painter/artist. I don't know the rules of basketball, but I threw the basketball once so I guess I'm a basketball player.
Join a football team and you are a football player, for at least a long as you play football. After that, you were a football player. This does not make you a professional football player, but a football player all the same.
Buy an easel, some canvas and some paint and start painting, you are a painter, for at least a long as you paint. After that, you were a painter. This does not make you a professional painter or artist, but a painter all the same.
Etc, etc, etc.
Don't get defensive. I am not attacking you. I was just making a point. For close to 10 years I was a Professional Computer Technician, but my first day on the job I was already a "Computer Technician" and I was still in training. It's just how things work out.