I have three questions, the first would be "What is the difference between to chase sth and to chase after sth?", the second is "Can I say "Now I can finally lift this mask", in the sense that I take it off?" and for the third you will have to read through the following lines:
Nothing is like it was before
I know not who I am anymore
Chasing something that's behind me
When will I be set free?
Don`t you actually have to say "I do not know who I am anymore"? The band is American, so it cannot be a mistake, but this is completely new to me, I´d be very happy if someone could explain this to me :)