I'm not going to say that art is subjective, though it is to a certain extent of course, because that just leaves the door open for any hack with a canny sense of marketing to create "art" that is nothing of the sort.
No, here's the real test of whether or not you've created art: Did it require any sort of talent and actual effort to create? Could a chimpanzee be handed a bucket of paint and turn around to produce a "work of art" indistinguishable from your own?
If the answers to those questions are "no" and "yes" respectively, you have not in fact created a work of art. Horribly ugly modern art statues that municipalities inexplicably erect in parks and other public places? Not my taste for certain, but the person who made them is still a bloody sculptor, and it is therefore art (bad art, but art nonetheless). A dirty bed that somebody else made and all you did was sleep on it, label it art, and sell it for a fortune? Not art.
This is why suspending a crucifix (that you didn't make) in a jar (that you didn't make) of urine (that you probably did make, but it's urine - the chimp could have done that part) isn't art, but painting a crucifix in a jar of urine would be.
Without the application of skill, what you've created is just junk that clueless people with far too much money will inexplicably pay for. Modern "artists" are laughing all the way to the bank.