You've never played with a pen, finger or spoon hitting different plates and vases on your table and amusing yourself with the drumming? Twanged a ruler on the edge of your desk? Congratulations, that makes you a musician.

Yes. Maybe not a good musician, but a musician nonetheless.

In the same way, making a joke to amuse oneself makes you a comedian.

Making a simple BASIC program to amuse yourself makes you a programmer.

And so on...