What does he want? Is he making fun of me? Why is he staring at me with a half smile?

Anonymous
I'm in high school. Some time ago, I saw a guy I found attractive and looked at him once or twice. But, some weeks ago, I saw his friends looking at me, sometimes while talking. I did my best to ignore them.
Later, I was going to go out with my friends and I saw one of his friends looking at me, smiling and laughing a little while talking to him. I ignored him, I didn't like that. I was under the impression that they were making fun of me (is it because I'm not self confident?). However, he (the guy I looked at) didn't say or do anything. So, I sat on the grass with my friends, not too far from the guy and I saw him, looking at me - more discreetly than his friend- twice at least.
From time to time, we (his friends and him - and my friends and me) are in the same corridor. I could see them turning their faces towards me while talking sometimes. Once again, I did everything I could to ignore them and tried to be impassive.
But the worst happened one week ago. I was leaving classes and found my friends to go to eat. As I was happy to see them, I smiled. But then I felt someone was looking at me and I looked up to this person - it was the guy - who was totally staring at me with a half smile (he did it twice).
Why was he staring at me with a half smile? Why his friends talk, laugh and look at me? What does he want? Making fun of me?
I explain I don't even know him or his friends. Same for my friends.
I don't expect something positive, only an explanation about this because it really troubles me.
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+1 y
Isn't he a little shy? That can be the reason why he did such paradoxical things, because he's nervous.
Updates
+1 y
I still think he's making fun of me and he did everything only to make me love him, what didn't happen.
I explain I don't love him or anything. Indeed, I didn't think about him until he started to - what I consider like - annoy me.
What does he want? Is he making fun of me? Why is he staring at me with a half smile?
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