Generally speaking I really enjoy engineering and programming. I started programming games from a young age and played a lot of Minecraft, which is really a lot of gamified engineering. I was already planning on studying Computer Science and so in my fall freshman semester when I heard about Quantum Computing I was super interested. I had a surface-level why, but I was still excited.
Right now, my motivation is that I find quantum mechanics really cool and I'm interested in computer engineering as an alternate (and more secure) career path outside of game development. Additionally, I find it really motivating to be working on problems that are very new and constantly evolving. I also enjoy drawing connections between many different subjects to come up with new ideas and perspectives (e.g. realizing how communicating a powerful meaning in a short poem is like modeling a physical scenario with a few terms of a differential equation). Hopefully, that example makes sense.
As I learn more and get deeper into quantum engineering I think my reasons why will become more refined, deep, and clear.