What should I do???

I have a cousin, she is 6 years younger than me. We meet 2 to 3 times a year, and I'm deeply in love with her.
I didn't have the guts to tell her. So I involved a close cousin, sam, who live near to her house. He told her what I feel about her and about the situation. She texted me, "What's going on?". I told her that I'm in love with her, and how serious I'm. She said,"I have never thought about it". After a day she didn't
reply to my messages, and after a week she told sam that she is not ready. What should I do? I'm really in love with her and I cannot concentrate on my studies.