How do I response to a Guy's attention? I am a very shy girl... What should I do?

All you got to do is show him you're not as shy as you feel. If a guy is giving you positive attention, go with it. Talk to him like he's your friend and don't act shy or like he's making you feel weird. Smile a lot and talk to him. Make it seem like you're as confident as can be. The first time is the hardest, but trust me it gets easier from there:)