Should sen her a love letter?

About a week ago I told my crush that I had a crush on her. She told me that she liked somebody else, but I know for a fact that she doesn't have crush on anyone. I think she just said that not to hurt my feelings. I have written a love letter telling her about my feelings for her and that I wanted to be with her. Should I send her this note and if I should how should I give it to her. Should I write my name on the bottom or give it to her anonymously , and should I give it to her in person or should I put it in a locker or secretly put it in her folder.
Please help I really like this girl and I really do care about her.
Should sen her a love letter?
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