Someone from the outside knows nothing and it can be daunting to try and understand what is going on in your life, how your family relationship works, etc. before someone can start to get to know you, personally. This particularly counsellor, from what you have told, does not sound like someone I would want to see again though. If possible I would try to see a private therapist rather than one from school, someone who is going to focus on you more. The school counsellor has to be more concerned with helping you as a student at their school be a successful student; you would not be at that particular place unless you were a student there.

However, I would be concerned for myself about the above, that you are worrying "out of place", not thinking about yourself and what you need. It sounds like you are putting a whole lot of padding around yourself that could stick to your wounds if you are not careful and cause you more pain and suffering. I remember my first session at my college, at the end the therapist merely said, "you hardly said anything at all about your father". After all I had said that I had never said to anyone else before (so it was traumatic to me, just to tell), it was a surprise, letdown statement but when I thought about it more, it was pretty telling? There are patterns, even from the first and they can turn out to be very important. You are very concerned about your sister and this therapist really picked up on that.

I would go to counselling again, but try to find someone for myself and would try to figure out how to concentrate on myself or what "about" my sister's situation is worrying me about myself, etc. You cannot do anything about your sister and her problems, they are hers. You are not there at home where she is, etc.