You were adopted by Aizawa because your mom didn't wanted a queer kid.

Your mom came to Aizawa's house one day, demanding you to come back.

Karen: "Where is she?"

Aizawa: "Who?"

Karen: "My daughter. Where is she?"

Aizawa: "Oh, I adopted her when you kicked her out."

Karen: "Gasp You kidnap her?!"

Aizawa: "Oh my god, open your ears."

Karen: "Im gonna count to ten unless you give back my daughter."

Aizawa: "Oh god, here comes the white girl counting."

Aizawa is tired.