Dear myself, don't say anything any more.
Your are in loss, and don't know when all of this will end. Though mirserable, despressed, and pressure, You must smile anyway. It is nothing serious, just that you fail to find the reason of happiness, and loss the expectation. Bear in mind, you are growing up, learing not to depent on others and dodge those unhappy. You must face up to them.
Dear myself. Keep silent, and leave youself alone to think over the things clearly. don't do those things which will make you too tired, and just do what you should do, instead of thinking too much.
Dear myself, don't show your emotions to your roomates, especially those unhappy, because they have not the responsibility to share your unreasonable and illogical feelings. When you are unhappy, don't say anything or make big decisions, or you may hurt othters and regret.
Dear myself, though don't know when all this will end, you should not be afraid, and go forward.
Believe, it is just a period and it has an end.Make a schedule, and do those you love.
Anyway, LOVE YOURSELF, AND TAKE GOOD CARE OF YOURSELF.