What's so weird about creating your own stuff? If I paint something stupid (like by numbers) and hang it in my room you're going to judge me?
This is not fine art, but it is creative. Lots and lots of creative pursuits are just tweaking shit others have provided as building blocks. I don't see how AI is different in this case.
Yes, playing Guitar Hero is super creative as well, almost like the real thing. Look, do whatever. But trust me, buying a cheap acoustic guitar and learning to play House of the Rising Sun, or buying cheap paints and canvas to for sunday landscapes would be million times satisfying, no matter what the quality of it is. This other stuff is just fear of creativity, failure and yourself.
You probably won’t listen, but trust me. You are missing out. Take a life drawing class. Learn to play an instrument. Live.