I think most people spent at least part of their childhood wishing they could change something about themselves. My best friend and I had opposite hair types (mine: corkscrew curls, hers: pin straight) and always wished we could switch.
But a common phenomenon seems to be that almost everyone spent some time thinking about having a different name. So, what was your dream name when you were younger? Mine was Amber. I’m not sure why, but I went through a phase where I wrote “Amber” on everything. I grew out of the phase, of course, but have kept a fondness for the name that I once wished was mine.