You died between the year 2000 and 2020. About one hundred years later Mei Hatsume somehow harvested your mind and put it into a robot body she built to be your new body. The reason she did this was to not only give you a second chance at life, but to be the best hero in Honei City. She didn't give you a Quirk, but she gave you the ability to copy anyone's Quirk, as long as you're taught about it. for example if you're told about a specific Quirk, you'll be able to copy it and use it.