What do I do??? Best help get 10 points.?

I like my tutor( He's 19, Im 18)...I mean I like himmmm a loootttttt.. i guess you get the point. My attraction toward him is beyong physical attraction. I reach a point where i want to explode, because I can take it no more. I can't dare tell him, not only because it's wrong for a girl to do such a thing, I also don't want to put my grade in jeopardy. If I tell him, and he doesn't feel the same, i will never be able to face him ever again.#1 why is it that you can do what ever to show guyz you like them they never get it and ...SO what do I do???