Boy Help? Pleae?

I have a bunch of questions. I'll start at the beginning of my tale. I like this boy in my kickboxing cl. I don't go to the same school as him. I've never talked to him, but I've talked to his mom. We've been in this kickboxing cl together for about a month and a half, and it's gonna end soon. Last Friday, as I was walking out the door, I turned completely around and saw him staring at my from the back of the room. I was gonna talk to him yesterday, but I was completely terrified. These last few weeks I've been trying to move closer to him to see if he notices me. But yesterday, I moved to the other side of the room, opposite of where he was. If he liked me, did I accidentally give him a sign that I didn't like him by moving away from his side of the room? What are some signs that a boy likes you?