Is it normal to meet the same person a lot of times that you never talked to?

The thing is.. I am the shy/studious girl in school. I noticed this quiet guy who is from a higher batch when I was sitting in the corner studying. Well I just glanced at him a little since his friends are being chaotic. Well he looked back too but yeah I was just too snobbish. Then I went back studying. He's more like a jock in my school but the quiet type. One day, I went to the mall waiting in vain for the line to push through just for me to pay some of my bills. I saw him there and just ignored it. But he came to me and said hi and talked about our upcoming graduation. I mean, why did he even talk to me? He's like popular and I'm just a random asian. Then the next day, I was about to get my transcript of grades. I fell the stairs and he's the one who caught me. He even said, "It's you again!" But I just walked away since I'm shy. Then earlier, I was doing scholar work in my school. I was waiting for the elevator to open, suddenly when it opened he was inside like literally just him. He said, "Hey! It's you again! It's been 3 consecutive days." I replied, "Yeah. I know. It's kinda awkward." And there I just walked away. Am I being paranoid that I think of it as a big deal? What does it mean? It's so awkward.