What does it mean if a Guy catches you looking at him and looks at you for a sec and puts a shocked face? Read details please?

ThatChick32
I've never talked to him but I know his sister. Also I've caught him looking at my direction several times. So I was at the park and thought he had kicked his socceball out of the fence and I was looking for the ball but I didn't see it and I looked at him to see if he was gonna get the soccerball and he caught me looking at him and he looked at me for a sec and put a shocked face and just went on continuing what he was gonna do which was go home.
I asked some friends for advice but they don't know what to say they say that what if the Guy thinks Im a little kid since most of my friends say I got a baby face that I look like 12 but Im 15. The guys 16 I think that what his sister told me

What does that mean?
Do you think he might like me or what?
Should I do anything or wait and see what happens?
Please don't say just go up to him and make a conversation he hangs out with a lot of guys since he plays soccer with them and that would be awkward.
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What does it mean if a Guy catches you looking at him and looks at you for a sec and puts a shocked face? Read details please?
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