However, I can simply say this is confessional poetry of great beauty, hard to read and not be moved and a little disturbed.
Life is a challenge for all. You can hide away from your emotions and fears or try to meet them and understand them. Sylvia Plath certainly confronted hers. Whether she ever came to terms with them, only she would know.
I can learn from her, try and express real feelings and not write formula stuff for predictable markets for the sake of making a few bucks.