Urgent: Need help... Some advice?

You see, there's this guy I really like, we are classmates, both on 6th Grade (don't even tell me "It's too early for stuff like that"). I'm planning on confessing, but I have absolutely zero experience when it comes to stuff like these. Sure, last year, I wrote a love letter to someone, but it turned out into an epic fail. We've graduated already, and we won't see each other anymore, but I just can't leave it alone. I feel that I'm not finished with my elementary life yet. Thankfully, there came a "Recognition of Top Students in the Whole Division" and we met again. (Not to brag, but in our school, I was the valedictorian and he was the first honorable mention.) I don't know what got into me, but I let that last chance fade away, right in front of me. I guess you could say I didn't prepare for it. But, luckily, we will cross paths again, because us five (with our parents, by the way) will go to our elementary school again and fetch our pictures from the school photographer. There's no guarantee we'll see each other again, but there's still a chance worth a try. Also, he's just two streets away from our house, at the same street of my gran and gramps' house. (I don't know the exact house, just the street) So... what should I do? By the way, I'm the "shy-quiet-nerd type" and I'm not that sociable. (Actually, not at all. Can't even make friends) On the other hand, he's the easygoing type yet awkward when faced with awkward and quiet people like me. Actually, for the whole school year, I'd say he just talked to me about thrice, only when our salutatorian orders him to. What should I do? (I won't accept usual answers like "Move on. There's plenty more out there." You don't expect me to rot and just throw this guilt away, right?) What am I going to do?