Miss A,Number one, There is no such thing as being out of your league. Trust me on this he maybe thinking the same thing., that you are out of his league.
I was very shy in high School. It took forever for me to let on that i liked a girl. Many years later i met up with a girl from my old high School. This was one of the most beautiful girls in the school. She told me that she had hada major crush on me all her Jr year. I was a Sr and she thought I would never go out with a Jr . In other words she felt i was out of her league. I was floored all that timeI thought she is out of my league. We hada good laugh about it. She is still a very beautiful woman with a great marriage and wonderful kids.
Just be yourself. Be open and friendly with this guy. Find out what things you and he have in common? Relaxe and enjoy getting to know each other.
rather then say i like you. Try this Hi (his name here) I have noticed you. You seem nice. Maybe we should get to know each other . Or something like that. unless his ego is way out there , most guys would be flatered by having a girl approach them. Like i said in High School I was very shy.