first time ...last time??

hey friends i dont know if i screwed up but give me suggestions, here's wat happened...
Iam 23 and the girl tht i like is 20
I stay in boys hostel and the girl tht i like in girls hostel which is near by,we have a common bus to go to college and sometimes we are in same bus...
About 15 days back i saw her in our college campus and i fell for her ..3-4 days i as jus doin staring game...then at time of valentine day i didnt see her and also not rest of the week, iam guessing she went home that time.
After one week i saw her again in canteen where i usually see her and
she glanced at me that time...
next day she and i sat in the same bus and when the bus reached the destination i stopped to see her and she gave a long glance at me and that GAVE me the confidence that today ill talk to her...so during canteen i was waiting for her ,she usually comes with her 2 female friends for lunch and i decided to approch her while they make a entry cause she never alone and thats the only chance i get
so i approched her and called out her name ....she looked at me and said
Who are u?? Who are u...... i dont know u ...i dont know u..
i said iamblah blah etc....then again
Who are u?? Who are u...... i dont know u ...i dont know u....poof..she goes off and iam jus standing ther thinkin wat the hell jus happened...
this monday i dont know how to face her again lol plz help i dont want to give up on this girl...my first time falling in love and having guts to go for it xD