Sonnet 20:

paraphrase:

Your face is as pretty as a woman’s, but you don’t even have to use makeup —you, the man (or should I say woman?) I love.
Your heart is as gentle as a woman’s, but it isn’t cheating like theirs.
Your eyes are prettier than women’s, but not as roving — you bless everything you look at.
You’ve got the good looks of a handsome man, but you attract both women and men.
When Mother Nature made you, she originally intended to make you a woman, but then she got carried away with her creation and screwed me by adding a certain thing that I have no use for.
But since she gave you a prick to please women, I’ll keep your love, and they can enjoy your body.

When I once read the title I expected the poem might be about a girl in particular the Fair Youth. However, I’m going to create some conjectures regarding the characterization of the protagonist of Shakespeare’s sonnets.

First of all, when the reader reads the opening line “A woman’s face, with Nature’s own hand painted” immediately knows the sonnet’s theme: indeed Shakespeare discuss the beauty of the Fair Youth, the male addressee of sonnet.
On first looking at the poem, the reader knows the narrator speaks about a woman but in reality he describes a man who has, as he said on the first six lines: “A woman's face with nature's own hand painted”.
Indeed, by saying “master-mistress”, the intelligent reader knows that the subject of the sonnet is not a women but a man.
Particularly, Shakespeare starts the description with a list in what a man is better that a woman: “a woman’s gentle heart” with which he wants to say that the man has not got a false heart like women; “an eye more bright than theirs” the poet says that his eyes are more lightly and valuable that women’ ones.
In addition, in the 7 line he said “a man is hue all hues in his controlling” that has a rhetorical construction, indeed Shakespeare says that the man is a true man and he has the control of all other men and women: he says “which steals men’s eyes and women’s subs amazeth” so this man attract both men and women.
Therefore, the poet argues that Mother nature was intended to create a women but it created a man, who was very beautiful, so Mother Nature fall in love with him and she got carried away with her creation.
Finally in the final couplet the poet uses sexual theme: “But since she prick'd thee out for women's pleasure” and “Mine be thy love and thy love's use their treasure”, but Mother Nature has made the fair youth for women’s pleasure “prick’d thee out of women’s pleasure” so in one hand the poet enjoys the youth love “mine be thy love” and on the other women enjoy the youth physically “thy love’s use their treasure”.
Concluding, talking about the scheme, there is one extra syllable in every line; 11 syllable rather than 10, this underlines the “adding one thing”; indeed Shakespeare compares the individual to a natural, indecisive woman so this creates a different between a man and a woman.

In conclusion, the poet seems to be disappointed and heartbroken: indeed in the first lines the poet describes who he loves, but finally he became depressed because he knowns that he can’t be with the Fair Youth.