How to answer "Where do you see yourself in five years"

Completely understand your concerns about  a too polished answer. Just quickly drafted an answer, maybe you can use parts of it:

“That’s a great question, and to be honest, as someone just starting my career, I’m still exploring where my strengths and passions might lead me. What I do know is that I’m really motivated to grow and develop in a role like this, where I can build my skills and make a meaningful impact. Over the next five years, I hope to gain a deeper understanding of this industry, take on new challenges, and work toward becoming a valuable team member who contributes to bigger projects.”

Not sure though if something like this works..

I recommend taking a look at the career steps in IB and figuring out where you would land in 5 years if you deliver a solid performance. That plus a good argumentation on your ambition to learn and develop should most likely do the job. 😊