This is a poem where you are trying to convince somebody of something they don’t want to be convinced of. The poem is an argument, an attempt to persuade. Think about all the situations where you are trying to convince somebody of something: getting out of a ticket, getting mom or dad to not ground you for breaking curfew, getting a date with your dream girl/boy, getting mom or dad to give you more money, getting a teacher to let you turn in late work.
As far as form, try to use couplets throughout your poem.
If you need some inspiration, try Andrew Marvell's "To His Coy Mistress".