Look how she feels about you! If she likes you, then this poem will be a beautiful memory of your love! If she has not paid attention to you, then this poem will make her eyes have you! If she doesn't have feelings for you, then she won't have feelings for this poem, and the answer you receive is only two words "thank you"!
Personally, I think writing poetry is too literary! If you are a teenager, you might as well do something crazy and overbearing to express your love! Girls are more interested in this! Or be romantic and sing with an acoustic guitar. ...
Finally, good luck!