I'm trying to understand the meaning of first part of Alan Walker & Ava Max - Alone Lyrics:
We were young
posters on the wall
praying we’re the ones that the teacher wouldn’t call
we would stare at each other
coz we were always in troubleAnd all the cool kids
Did their own thing
I was on the outside always looking in
Yeah I was there but I wasn’t
They never really cared if I wasn’t
Does that mean, when we were young posters of us were on the wall? If so, then how it goes from this to, they are in a school prying for teacher doesn't ask them questions? And in the second part it says I was on the outside of the room! I'm curious about understanding meaning of the lyric. I would appreciate if you could help me to understand its meaning.