I am a teacher in one High school and I am 22. I am in love with one of my students. What shall I do plz help.

I am a teacher in one High school n I am 22 male. I am in love with one of my students. I am shy and I have never talked to the girl that I am in love with. I have never discussed with my students about ual matters. I don't want even a single student know that I am in love with her, I want to do it secretely. How can I go on. Shall I give her a card, ask he email adress or just say her 'I love you' what is better. Plz hlp I am dying.