Relationship Advice PLEASE HELP! :(?

Okay, So i am in love with this girl Danielle. I have known her for about a year now and hang out with her ALOT. She told me she likes me more than a friend. I got very happy. So daily i would write her the sweetest poems and just i love you after i love you EVERY MONTH AFTER MONTH. And finally i wanna date her. Today she tells me she dosnt wanna commit to a relationship. Why? She likes this kid named mike that she has known for only 3 weeks. What do i do ?!?! I love her with my entire heart for months upon months. and she tells me she likes this guy she has only known for 3 weeks and barely talk. Am i doing something wrong? I just, am so helpless.