Girls, please help!!! What would you think...?

Im a shy boy and I really fancy a girl on my bus. I don't know her at all but I do know her brother. I am going to start the same athletics club as her and she might think I'm stalking her because she has seen me looking at her. Is this a possibility. If your a girl please tell me if you would think thAt. I'm joining this club (atletics) because I'm a good sprinter and my sister used to go to that club so my mum suggested it so I said yes. I found out she goes from her brother