In your opinion, am I REALLY in love?

Okay, this is gonna be long but I would appreciate it if you read all the way through.. When I was little, my best friend EVER was a guy. We did everything together! I moved away when I was about 4. After moving away, we would come back to visit during the summer and on Christmas break. I would still see him and we would do stuff together (he lived down the street from my Grandma and would come over to play). When I was about 7, I started worrying about what I wore and made sure I looked pretty around him. As I got older, we started to drift apart and when he would come visit, I would hide because I was afraid he wouldn't like me anymore. Well, he stopped visiting and I would only ever see him at church with all his friends. When I was 13, I moved back. We were living with my grandparents for a couple of months while the renters found a house. One day, I was watching some old home videos my Grandma had and I cam across a video from when they visited us in Texas. It showed me at about 5 drawing a picture. When she asked who it was for, I said it was for him. The picture was of us holding hands and on the back it said "One day, we will be married. I promise" Only a 5 year old's version. I'm 15 now. He still goes to my church and since I have moved back, SO many things have happened that are just so... ironic I guess you could say. We were always being paired up by my youth minister when we payed games, were always the two that the teachers used as an example in class, and so many other things.. I have a class with him at school. One day in class, we were sitting in a circle and every time I looked up, he was staring at me. At first I though that it was just a coincident, but then he just kept looking up at me. That's when the butterflies started. Then one night at church, we had a devo and I sat next to him. I had my legs crossed and was shaking my foot. He kepts tapping my foot with his but I just rolled my eyes and he would smile. Just, ever since we were little, I've felt like he was the one I was going to marry. He has a couple of girl-friends and even though they are just friends, I get SO jealous that they are getting his attention and not me. He's not all that cute (to everyone else) and there's nothing special about him... but every time I see him, I want to run up to him and throw my arms around him and never let go. EVER. He is all I think about and I would give up anything for him to love me. Sometimes though, I get really sad cuz I don't think he does, nor will he ever. Will someone please tell me...

Am I in love.. Or is it just lust?