I was more overpowered than the hero, so I hid my power!

“Ever since I was a child, I’ve loved the ‘normal and light-looking but hides his strong powers’ type of character.
And then, a chance for rebirth came!
“What would you like to be in the new world?” they asked.
“I want to be someone who hides their true powers and strength!”
…But I didn’t mean it to be like this!?”