Girl help, i'm in love with her. help please?

I'm in love with this girl. she is a cordial friend. evrytime we meet she greets me with this warm hi. bt when ever we are out with friends , she always keeps a distance. & leaves me talkin with her friends. how can i get to talk to her how do i start a proposal. we dnt know each other much. i dnt hv a her number. i wud love to do it face 2 face. sos!!asap constructive answers are welcome. dnt answer if u just want 2 get noticed. dnt evn dare i need real help. thanks vry much in advance for all the great answer(s). my God fill ya cup to an over flow.