I used to think I knew everything

And then I turned 15

I used to think I had it all

And then I turned 16

I used to think the world was mine

And I learned that was true

When I turned 17

I used to think I knew everything

And then I turned 21

I used to think it was all mine

And then I turned 23

And then I learned that part of changing

Was growing 

And learning

And never accepting

That I used to think I know everything