Girl help! i need a way to talk to her !!!?

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ok theres this girl i think who is the most prettiest girl i seen and she aint like all those other girls like idk i cant describe it first time in my WHOLE life i actually felt like this i dont know her at all but her name and nethier does she know me but at lunch she sit in a table across and i always catch her looking at me and i do the same and when i walk to class and she infront of me and she KNOWS that iim behind her she looks back but to main point idk what to say because i dont want to sound stalkish you know like what if she thinks im a freak idk what to say do i ask for her number idk im really confused im HAVE TO DO THIS I CANT STAND NO MORE and after spring break im doing this program which gets me out of school so i wont ever see after that i really really NEED TO WHAT TO SAY please and thank you