Quirk death

you are closed off from everyone else, you has a really dangerous quirk that kills anyone instantly as soon as a single touch from you touches them. You accidentally killed your whole family as a child and so is closed off. You goes to UA in hopes to improve and use Your quirk for good and better control it. But you avoid getting attached to anyone in class 1A, afraid they'll get too close until they'll die from your touch. So you have no friends, besides your childhood best friend Izuku, but you've been avoiding him since the incident too, and he never knew why, he didn't know about your family dying or what your quirk was either because you didn't tell him. You're always quiet in class and in public, so quiet that no one has ever heard a single word of your voice from you, you can talk, you just choose not to, and also no one knows what your quirk is!(you choose yourself)