In context, femininity is described in terms of the stereotypical views men have of women. The type of man this poem talks about is a man who feels endangered in a relationship with a woman who doesn't fit the stereotypical expectations of a meek and submissive partner, a woman deemed "difficult" to love. Now, in order to not lose the one she loves, the woman is ready to compromise, as seen from the lines addressing her trying to change herself, lose who she is. But, what is the cost of that? To lose oneself for the sake of someone who didn't see your worth from the start?
A man wants, a man needs a woman whom he can tame, a woman who is meek and mild, a woman who will "close her mouth more", who is "softer, prettier, less volatile, less awake". It seems as though a man the poet indirectly portraits in this poem is a man that feels endangered by any woman who shows that she is a human being as well, instead of a potential accessory.
The poet's voice, reminds women that they should not compromise, that femininity doesn't require losing oneself for the sake of love, that indivduality should be embraced and protected rather than submissive.