I need help with this girl please help?

ok so this girl named grace is in my homeroom and 2nd period and i really like her but i havent talked to her yet i just couldnt and i think she likes me too like when she talks to her friends i see them point at me and she smiles and at lunch i heard them say my name in their conversation and she said yes to watever they said... what do i do plz help me out i usually just talk to girls i never have this problem HELP!!!!!!!!!!!!!!!!!