What would Ты do ?

Imagine the following situation:
Ты are on a school trip since one week. A few days назад there was a boy who сказал(-а) that he loves you, but Ты don´t know who he is and Ты notice that Ты don´t like his character.
Two days later all people from your class making a party downstairs, but Ты stay in your room, cause Ты feel ill. Ты turn the light off and go to bed, after Ты drank a bit valerian for better sleep. Then suddenly someone open the door a bit and looking into the room and than the door is closed again. This repeat two times more. A few минуты later, when Ты nearly sleep, the door opens again and somebody come into your room, but Ты don´t really notice it. This person comes near to your постель, кровати and than Ты can feel fingers which are pulling down your blanket and trying to touch you. Than Ты wake up and see this one boy, Ты really don´t like. The boy laugh and run away.
Ты are frightened and begin to cry.

What would Ты do the Далее day?
Would Ты tell it a teacher, do nothing, или go to the boy and beat him etc for that what he did?

I hope my English wasn´t so bad and Ты can understand the text. ;P