Here's my hot take... Nothing is original. (I will add a TLDR)
"Our" ideas are actually OUR ideas. Everything that was thunk and that will be thunk is just consequence of the world and everything in it. You yourself probably participated in some grand "idea" that has been made, or still to come. Even just by being a bystander. Every little thing adds up in our:
- c o l l e c t i v e u n c o n s c i o u s -
Now with the esoteric part out of the way (Kinda), here's a more real example of "originality"
Would you say the guy who invented the escalator just copied the guy who invented stairs? Or maybe the Italians "Stole" noodles from eastern Asia?
Innovations and the remixing of ideas is integral to being HUMAN!
So, so what you have an idea for an animation that has some (insert modern relevant idea). I've came to the conclusion that when I form a new idea, many others will have captured the same fish. Some sorta cultural influence will inspire us to analyze and break it down. And most of the time, people will come to the same conclusions (Ideas) WE'RE HUMAN! We work like a network. We think similarly to fit in and benefit the tribe. The caveat is, our personal experiences is the tool we use to mold all this information into a understandable thought. So if you need help making something more original, dig into that. Who YOU are. The unique being that has only lived the life you live.
And when it comes to idea theft. We're human after all, and because we're human we can understand other humans intentions. So giving context clues, we can tell if someone's work has "soul" or is just a cheap imitation for the soul purpose of chasing the bag (fame, money, power, whatever)
TLDR & Conclusion:
In the least cringe possible way. You are one of one. The way you think Is truly unique to you. If you believe in yourself and are not trying to "copy" someone else interpretation of an idea. GO FOR IT!
Don't let over thinking hold you back, Trust me.