Lovesick and i need help!?

ok i cant stand it anymore! i am totally in love with this girl! me and her are pretty good friends and we might go to the movies this week together, i have her number and she gave me her address to hang out. we havnt hung out yet thought but as i said we might this week. we arnt considered bf and gf yet though. how do i make her my gf or how do i make her want to be my gf! HELP I CANT EAT OR SLEEP WITHOUT HER ON MY MIND!!!!