Analysis of Scrub

If I grow bitterly,
Like a gnarled and stunted tree,
Bearing harshly of my youth
Puckered fruit that sears the mouth;
If I make of my drawn boughs
An Inshospitable House,
Out of which I nevery pry
Towards the water and the sky,
Under which I stand and hide
And hear the day go by outside;
It is that a wind to strong
Bent my back when I was young,
It is that I fear the rain
Lest it blister me again.