Just open up yourself and smile more. Be friendly, and
naturally, people will talk to you. Just be yourself, and don't
think so much when you want to make friends.
Regarding this girl... well, she is attached. More or less, I think
why you are feeling this way towards her might be because she is
one of the few girls that you can really talk and communicate to.
So there is a high chance that it might be just mere
infactuation.
Keep a clear mind, focus and tell yourself that she is just a
friend. And she is the beginning of more friendships that has yet
to come for you.
Just concentrate, and study hard. Be happy, be cheerful, and
friends will come. About the rest, time will tell. 
