You are the newer student. You have only been with class 1-A for two weeks now..

Aizawa: walks in the classroom and looks at you but ignores you

Midoriya: looks at you oh hello!

Mina: walks in laughing and being loud with tsyu and uraraka

Uraraka: laughing

Tsyu: laughing

Kirishima: walks in running with denki chasing him around

Denki: Chasing kirishima around the classroom

Mineta: stalking you from underneath the desk

Sero: reading at his desk in the corner

Everyone walks in and starts doing their own thing as the bell rings

Bakugo: walks in late and sits in the desk behind you picking on Midoriya