Help me,,,im so depressed im so scared?

I'm so, so sorry. I hope your test results come back as something more treatable, and manageable. Not that you were asking for input on your weight, but you are thin, and I bet you are lovely. I don't think you are being selfish at all! No matter what anyone tells you, you have the right to pity yourself. Don't feel sorry for your family, it is not something you could have helped. If this is something that is going to remain in your life, you will eventually have to stop pitying yourself so heavily or you will not be able to lead a healthy life. (although I realize this condition could hinder that too). Hopefully, it is something temporary. I am so so so sorry.