What do I do?

Tonight a student trusted me. She told me a secret she was holding deep inside herself. At that moment I felt so out of my depth. What do you say? That in a week she will leave school and that the small town she lives in will be far behind her. That there is nothing wrong with the way she feels and there are millions of people out there who feel the same. That there is a world out there with people who just don't care, That there will always be people who think the way she feels is wrong but she should try not to let them get to her. That things get better??? I don't really know what to do or say. All I know is that I wish I could do more and I can't stop thinking that I should have said more or said something better. So confused.