I think my superpower of choice would be the ability to manipulate time. Not just in the sense of traveling through time, but more like... bending the fabric of it. Imagine being able to rewind, pause, or slow down time at will. It'd be incredibly useful, you know?
You could use it to learn new skills ridiculously fast, just by rewinding and retrying over and over. Or, you could pause time to take a quick nap whenever you're feeling tired – no more caffeine jitters needed. And if you're in a tight spot, you could slow down time to think things through and come up with a plan.