Why dont you notice me

All in the halls i look at you
but you never notice me
i drink at the drinking fountain
your right behind me

i take a long drink so you will tap my shoulder
but the bell rings when you go to tap me
so you go the class the same as me
but you dont notice me

the next day i bring treats
but all you say is thank you
i give you a coockie at lunch
but you only say thank you

why dont you ever notice