Xtremely cutte guyy. How do I start up a converstaion with him?!? I know it's long but plz read and answer?!?

Ok there is this really cutte guy I like. He's a junior, a varsity football player. I'm a lame sophmore. We have like no cles together so I can't make conversation with him using that excuse. Take today for example. I saw him between cles and it was raining. There was a crowd of kids that swarmed in every time he tried to get out or when I tried to get in. Finally when there was like no more kids pushing, he held the door open and I went inside. I swear I was like on Cloud 9 for the rest of the day. I was gonna buy ice-cream for my friend and I when I saw him standing there buying ice-cream. I just gaped and ran to my seat in fear and a bit of giddy feeling. I was so nervous. My hands were clammy! I didnt even know this was possible with my hands! I don't know what's the point of liking him. My parents won't let me date till I'm old enough to marry. Don't ask- it's a religious/cultural thing. So I keep telling myself that there's no point of liking him, but I can't change how I feel! I know I cant date him but I wanna at least get to be friends with him. Get to know him. Then maybe... and my parents might actually let me go to like a dance with him or something- idk?!? What I do? What are some conversation excuses I can use with him?!? The only time I see him is between chemistry and math for me and something and something for him. && he also has the same lunch as me. How can I talk to him without sounding retarded or weird?!? How can I like open up a conversation which might lead to introducing ourselves. I dknow?!? Any openers or tips?!? Thanks soo much for all your help- cant wait to see the great SENSITIVE (I hope) answers :)