How to talk around girls?

hi guys I have a problem here the girls whom I know love me because of which I am popular and I am a all rounder I study well and I am good at sports I am shy type and I cant talk properly with girls how do I behave decently and tell them in a polite way to f off and the girl whom I like likes me too but she is afraid to tell me what do I do

just tell them how you feel really,
just bluntly tell them that you dont like them
it cant get any clearer than that!
and if you both like each other then thats good
but it will go nowere if your both too shy to tell each other
if she likes you but doesnt want to tell you then it looks like youll have to do the talking!
just go up to her when shes alone or not busy and tell her you like her!

just flirt with her, be close to her (friend like), make sure she knows she means something to you, then eventually tell her.