Dilettante

dil·et·tante
noun

1. a person who cultivates an area of interest, such as the arts, without real commitment or knowledge.
2. a person who takes up an art, activity, or subject merely for amusement, especially in a desultory or superficial way; dabbler.
3. a lover of an art or science, especially of a fine art.

Most often used as an insult, but what’s wrong with being an amateur? A dabbler? An UNprofessional?

Nothing. Not a damn thing.