So far, I have...
I just wanted you to know that I've had a crush on you for a while now, but I was too shy to say it in person. Anyways, I wish you the best of luck in your high school career. (PS: smile more often because you are beautiful)
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Add something like this, "I wish I could turn back the hands of time, so I could tell you that you are the one that made my days in school special. I'm ashamed I didn't take the time to tell you what you..."