I'm scared. I'm a guy and there's this guy that tries to make me laugh and looks at me when I don't look at him and smiles at me all the time. He is my sister's friend's brother. I'm not gay.?

OK, maybe he just wants to be your friend. If that's all he wants maybe you're just over-reacting. Would you like to be just friends with him, and that's all? Maybe loosen up a little and be more friendly. Maybe if you do that he won't be trying so hard. On the other hand, if you feel a bit scared, then maybe he is a bit creepy. You can stay away from him, can't you? Do things with other friends so you don't have to be with him.