numb的结构？

I'm tired of being what you want me to be
Feeling so faithless, lost under the surface
I don't know what you're expecting of me
Put under the pressure, of walking in your shoes
(Caught in the undertow, just caught in the undertow)
Every step that I take is another mistake to you

[Chorus:]
I've become so numb
I can't feel you there
Become so tired, so much more aware
I'm becoming this, all I want to do
Is be more like me and be less like you

Can't you see that you're smothering me?
Holding too tightly, afraid to lose control
'Cause everything that you thought I would be
Has fallen apart, right in front of you
(Caught in the undertow, just caught in the undertow)
Every step that I take is another mistake to you
(Caught in the undertow, just caught in the undertow)
An' every second I waste is more than I can take