Missed Chances, past present and future

There is a girl that I like and possibly love. She is the only one I have feelings for. I have had feelings for her since the first day I saw her, in 4th grade. I think my feelings for her have only gotten greater. I am now in 7th grade, and I never got to know her. I am always too shy to say anything to her. The only time I can talk to her is if she talks to me, and even then, I don't say very much. She is beautiful (not hot), athletic, smart, nice, and shy. I like the shyness, actually. Who knows, she may have feelings for me too (but I doubt it). And if she does, and I continue at the pace that I am going right now, me and her will never be together. She is the only one I would like to spend my life with. I want her to know, but I don't want her to know. I may, however, write a letter to her from anonymous that someone has feelings for her, and have someone put it in her locker (My best friend, not some random person). I am very afraid and sad at this part of my life. I need help. I don't want to spend the rest of my life thinking what could have been if I wasn't so shy.