OK! If it were my poem, I would do this to emphasize the sort of neoclassical rhyme/meter thing you’ve got happening:
I dedicate this poem to future exes.
You’re yet to come but I’m aflame already.
I’ll drink you up and celebrate your presence.
Like Ariana whisper, ‘Thank you next one!’
I’d like to fill this poem with deep forgiveness.
You’ll need that later when you want to kill me:
I’m a princess who’s not fond of princes
(or “I’m a queen who doesn’t like the princes”)
To me the dragon’s always more appealing.
I love you dearly, all my dear future exes.
I hope we can be friends when it is over.
I never aimed to be your chain and shackle
(or if you’re going for the near-rhyme like in prior verses “I wouldn’t want to be your ankle fetter”)
I’d rather want (alternately “I’d much prefer”) to be your four-leaf clover.
The important thing when you’re going for a strict meter is to read it out loud to yourself to make sure everything’s in the right place. Really, really nice work here; I love the inclusion of the Ariana Grande quote.