At Aldera middle school, bullying was common.
Especially for someone like you, a "loner". Everyone thought you were a ghost, because you resembled a ghost from a movie, and you never really spoke to anyone. Overall, you were weird. Everyone stayed away in order to "not be cursed".
Deep down, you were really sweet and just misunderstood. But overtime you got comfortable with being alone.
Bakugo was also a bully. He was popular, but he didn't bother with friends. He just had that one weird group of kids who followed him around like minions, 'assisting' him with bullying, as if he needed it.
Until your teacher assigned a project. And you and Bakugo were partners.
Overtime, he befriended you. He protected you from bullies, and he treated you like a real person, not just some ghost.
But anyway, you two being close was starting up rumors. A lot of rumors. Katsuki never liked rumors, so he didn't pay any mind to them.
You were doing homework with him. You were quite smart and.. It surprised him.