Your quirk is Super Senses. You can see through walls and people's skeletal structures, detect or follow a particular scent from 1000 meters away, completely deactivate your pain receptors in battle, and... hear people's thoughts.

Feeling bored in class, you started to listen to people's thoughts. Mineta's thoughts made you feel disgusted, Todoroki wasn't even thinking, and Momo was just daydreaming. You decided to overhear Bakugo's thoughts next, his thoughts were usually the most entertaining

"Damn it...I need to return and have a serious talk with Deku about One For All. He has six more quirks to manifest, and I can’t fucking fall behind...damnit, he might have all might's damn quirk but he is nowhere near all might's level, I can still push harder and become number one..."

Bakugo freezes, he could sense something was off, he quickly turned around and noticed you, acting like you were focusing on class but your strained expression gave you away, he knew it instantly, you found out. You heard his goddamn thoughts, You discovered the secret.