There is nothing original under the Sun. There is nothing original over the Sun either. Everything is a copy because existence is not moving like an arrowhead but rather in a circle. John Wolfgang Goethe said "All the great thoughts have already been thought you've to just rethink them."
What is considered original in field of Arts, Science and Creativity? Something which a group of people has not seen earlier is regarded as original. Now, if you could look at entirety of existence, the whole circle in the field of your vision, you would realize that there is nothing original.
Does it mean that you should not strive to be creative and original? No, it doesn't. It just means that you should give up the conviction that you're original and you should also give up the proud which comes with it. Your ideas are not actually yours. You may not know but they've been there forever. With this comes a great freedom! Stealing the creative works of others is very bad. Trying to create something on your own is great for opening your heart up and it takes you into a direction of self realization. It gives you a sense of accomplishment, but if it starts making you proud of your work, it's taking you into wrong direction. It's of utmost importance to remember that all ideas, however novel or stale come from a common source Noosphere.
It's a good exercise to be original. It makes you wiser and truthful and gives you a sense of becoming whole by creating. Always remember you are already whole and you don't need anything else to make you complete. Being proud of anything you think or do is a movement in ignorance. It's an unnecessary drawing of boundaries where there are none!
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