OK, do NOT tell her that you love her, you'll frighten the poor girl to death!
Your intesnse feelings are completely normal, and I understand how hard they are to deal with.
What you need to understand is a basic aspect of relationships with girls - just because you feel so intensely about her does not automatically mean she feels the same way about you.
What you need to do is find out how she does feel. Ask her to the pics, or for a burger, something like that, as friends. Take it from me, if she is romantically interested in you, she will let you know. You will get non-verbal signals, she will sit close to you, touch your arm a lot, hold hands when you walk, that kind of thing.
If she is not showing these signs, it means she likes you as a friend,but she doesn't fancy you at the moment.
This way, you find out with making yourself look and feel foolish, and you can get past your feelings (impossibe I know!) in private, and still be able to see her at school.
This may be a crushing blow, but if she is not keen, nothing you say is going to change her mind, would be great if life worked like that, but it doesn't.
So - if she is keen, take it very gently, and don't go declaring love in these early stages. If she is not keen, then you have to accept that and transfer your feelings to another girl who is going to return them - chasing someone who is not available just hurts loads, and is simply not worthe pain - trust me!
I hope this helps - please let us know.